DVM (Doctor of Veterinary Medicine) Exam — Questions and Answers

Question 1: A beef cow is found with a protruding red mass from the vulva after calving. The mass is approximately 30 cm diameter, edematous, and has visible caruncles. What is the diagnosis?

Vaginal prolapse
Rectovaginal fistula
Vulvar hematoma
Uterine prolapse (Correct answer)

Correct answer: Uterine prolapse

Uterine prolapse is identified by the presence of caruncles (cotyledons) on the exposed tissue and occurs shortly after parturition, requiring immediate replacement or amputation.

Question 2: You are called to a dairy farm to examine a cow that calved 6 hours ago. The owner reports a large, reddish mass protruding from the vulva. Upon examination, you identify a complete uterine prolapse with the caruncles visible. The cow is standing but straining. Which of the following is the most critical first step in managing this case?

Immediately attempt to manually replace the uterus using firm pressure.
Administer a high dose of oxytocin to cause uterine involution.
Administer a caudal epidural anesthetic. (Correct answer)
Start intravenous fluids and broad-spectrum antibiotics.

Correct answer: Administer a caudal epidural anesthetic.

The most critical first step in managing a uterine prolapse is to administer a caudal epidural anesthetic. This will stop the cow's straining (tenesmus), which is essential for successful replacement of the uterus and prevents further trauma to the tissue. Attempting replacement without an epidural is often futile and can lead to uterine rupture or other complications. While fluid therapy and antibiotics are important supportive measures and cleaning/reducing edema of the uterus is necessary, controlling the straining via anesthesia must be done first.

Question 3: Which suture material is most appropriate for closing the uterine incision during a bovine caesarean section?

Chromic catgut in a Lembert pattern (Correct answer)
Braided polyester in a horizontal mattress pattern
Monofilament nylon in a simple continuous pattern
Stainless steel wire in a simple interrupted pattern

Correct answer: Chromic catgut in a Lembert pattern

Chromic catgut or synthetic absorbable suture in an inverting pattern (Lembert or Utrecht) is standard for uterine closure in cattle, providing adequate holding strength while being absorbed before subsequent pregnancies.

Question 4: A cat presents with polyuria, polydipsia, and a pendulous abdomen. Bloodwork shows hyperglycemia and elevated liver enzymes. Which condition is most likely?

Chronic kidney disease
Hyperadrenocorticism (Correct answer)
Diabetes mellitus
Hyperthyroidism

Correct answer: Hyperadrenocorticism

Hyperadrenocorticism (Cushing's disease) in cats causes PU/PD, pot-bellied appearance, and elevated liver enzymes due to excess cortisol.

Question 5: Which electrolyte imbalance is classically associated with 'downer cow syndrome' after parturition?

Hypocalcemia (Correct answer)
Hyperkalemia
Hypernatremia
Hyperphosphatemia

Correct answer: Hypocalcemia

Parturient paresis (milk fever) results from acute hypocalcemia as calcium demand for colostrum and milk production exceeds mobilization capacity.

Question 6: What is the primary advantage of the ventral midline approach over the flank approach for exploratory laparotomy in horses?

Ability to perform surgery in the standing horse
Reduced operative time
Superior visualization and access to the entire abdominal cavity (Correct answer)
Decreased risk of wound dehiscence

Correct answer: Superior visualization and access to the entire abdominal cavity

Ventral midline celiotomy provides access to all abdominal compartments, enabling the surgeon to examine, decompress, and correct any region of the gastrointestinal tract.

Question 7: Which of the following is the mechanism by which succinylcholine causes neuromuscular blockade?

Persistent depolarization of the motor end plate, preventing repolarization (Correct answer)
Competitive antagonism of acetylcholine at the nicotinic receptor
Inhibition of acetylcholinesterase at the neuromuscular junction
Blockade of presynaptic voltage-gated calcium channels

Correct answer: Persistent depolarization of the motor end plate, preventing repolarization

Succinylcholine mimics acetylcholine but resists hydrolysis, causing sustained end-plate depolarization that renders the muscle unresponsive to further stimulation.

Question 8: In ruminants, which forestomach compartment is responsible for mechanical breakdown of coarse feed through muscular contractions?

Abomasum
Omasum
Reticulum
Rumen (Correct answer)

Correct answer: Rumen

The rumen is the largest forestomach compartment and performs mechanical breakdown of coarse feed through muscular contractions and fermentation.

Question 9: In iguanas, metabolic bone disease (MBD) is most commonly caused by a deficiency of which nutrient?

Vitamin B12
Phosphorus
Vitamin E and selenium
Calcium and Vitamin D3 (Correct answer)

Correct answer: Calcium and Vitamin D3

MBD in iguanas results from inadequate calcium and/or Vitamin D3, often due to poor UVB lighting or imbalanced diet.

Question 10: During a wellness exam, you detect a grade III/VI left basilar systolic heart murmur in a 6-year-old Doberman Pinscher. Which condition is this breed most predisposed to?

Mitral valve disease
Hypertrophic cardiomyopathy
Pulmonary stenosis
Dilated cardiomyopathy (Correct answer)

Correct answer: Dilated cardiomyopathy

Doberman Pinschers have a genetic predisposition to dilated cardiomyopathy (DCM), which can present with arrhythmias and congestive heart failure.

Question 11: A rabbit undergoing ovariohysterectomy develops bradycardia and hypotension after induction with dexmedetomidine and ketamine. What is the MOST appropriate pharmacological intervention?

Atropine IV to treat bradycardia
Dobutamine CRI
Epinephrine IV bolus
Atipamezole IM to reverse dexmedetomidine (Correct answer)

Correct answer: Atipamezole IM to reverse dexmedetomidine

Atipamezole reverses dexmedetomidine-induced alpha-2 agonist effects, restoring heart rate and vascular tone without requiring additional drugs.

Question 12: A cat's urinalysis shows a USG of 1.008 with concurrent azotemia. How should this finding be interpreted?

Renal azotemia with inadequate concentrating ability (Correct answer)
Normal finding in cats
Postrenal azotemia
Prerenal azotemia with adequate concentrating ability

Correct answer: Renal azotemia with inadequate concentrating ability

A USG of 1.008 (isosthenuria) with azotemia indicates the kidneys cannot concentrate urine, pointing to primary renal disease.

Question 13: A reptile patient has bilateral swollen eyelids and copious mucoid ocular discharge. The condition is not true conjunctivitis. What is the correct diagnosis?

Corneal ulceration
Thermal burn
Infectious stomatitis
Hypovitaminosis A causing subspectacular abscess (Correct answer)

Correct answer: Hypovitaminosis A causing subspectacular abscess

Hypovitaminosis A in reptiles causes squamous metaplasia of lacrimal ducts, leading to fluid accumulation behind the spectacle (subspectacular abscess), mimicking eye swelling.

Question 14: A 6-year-old male intact dog presents with fever, lethargy, and purulent preputial discharge. Ultrasound reveals a fluid-filled uterus. What is the diagnosis?

Prostatic abscess
Pyometra (Correct answer)
Perianal fistula
Cystitis

Correct answer: Pyometra

Although pyometra occurs in intact females, this question tests clinical reasoning — pyometra is a uterine infection in intact females presenting with uterine fluid accumulation and systemic illness.

Question 15: The vet asks for 600 cc of a solution. The measuring device only contains milliliter (ml) marks. You are aware of what 600 cc in mls is comparable to because:

Cc and mls are equivalent (Correct answer)
An ml is twice the amount of a cc
A cc is twice the amount of a ml
An ml is half the amount of a cc

Correct answer: Cc and mls are equivalent

In medical and scientific contexts, one cubic centimeter (cc) is precisely equivalent to one milliliter (ml). This is a fundamental conversion factor in the metric system, meaning they represent the same volume. Therefore, if a vet requests 600 cc of a solution, the same volume can be accurately measured as 600 ml using a device marked in milliliters.

Question 16: An avian patient shows green-stained urates and lethargy. Which organ system dysfunction is most likely indicated?

Hepatic disease (biliverdinuria) (Correct answer)
Renal disease
Respiratory infection
Gastrointestinal obstruction

Correct answer: Hepatic disease (biliverdinuria)

Green urates (biliverdinuria) in birds indicate hepatic disease, as birds excrete biliverdin rather than bilirubin, and liver dysfunction causes biliary pigment to spill into urine.

Question 17: Which technique is preferred to prevent regurgitation and aspiration in brachycephalic dogs during anesthetic induction?

Mask induction with isoflurane for 5 minutes before intubation
Administration of metoclopramide 2 hours before induction only
Pre-oxygenation followed by rapid sequence induction and immediate intubation (Correct answer)
Prolonged sedation with acepromazine before induction

Correct answer: Pre-oxygenation followed by rapid sequence induction and immediate intubation

Rapid sequence induction with pre-oxygenation minimizes the time the airway is unprotected, reducing aspiration risk in brachycephalic dogs prone to regurgitation.

Question 18: A bovine blood sample shows a fibrinogen concentration of 900 mg/dL (reference 200–400 mg/dL). Which condition is most consistent with this finding?

Hepatic failure
Disseminated intravascular coagulation
Protein-losing nephropathy
Acute inflammation or infection (Correct answer)

Correct answer: Acute inflammation or infection

Fibrinogen is a major acute-phase protein in cattle, and markedly elevated concentrations indicate significant inflammation or infection.

Question 19: When performing a herniorraphy for umbilical hernia in a foal, which layer is most critical to close to prevent recurrence?

External fascia and linea alba (Correct answer)
Skin
Peritoneum alone
Subcutaneous tissue

Correct answer: External fascia and linea alba

Secure closure of the fibrous hernia ring, including the external fascia and linea alba, is essential to eliminate the defect and prevent herniation from recurring.

Question 20: The chewing-gum-type seizure is a common anxious symptom in canines suffering from

Canine parvo viral gastroenteritis
Rabies
ICH
Canine Distemper (Correct answer)

Correct answer: Canine Distemper

The 'chewing-gum' seizure, characterized by repetitive jaw movements, is a classic neurological sign associated with Canine Distemper virus infection. This symptom is often seen in the later stages of the disease when the virus affects the central nervous system. It is a distinct and severe manifestation of this highly contagious and often fatal illness.

Question 21: A beef cow on a lush legume pasture presents with severe abdominal distension on the left side, dyspnea, and grunting. The distension is firm and non-reducible with a stomach tube. You diagnose frothy (pasture) bloat. Which of the following is the most appropriate treatment?

Administration of an anti-foaming agent, such as poloxalene, via stomach tube. (Correct answer)
Trocarization of the right paralumbar fossa to release free gas.
Intravenous administration of calcium gluconate to stimulate rumen motility.
Oral administration of a large volume of cold water to 'shock' the rumen.

Correct answer: Administration of an anti-foaming agent, such as poloxalene, via stomach tube.

Frothy bloat, or primary ruminal tympany, occurs when fermentation gases are trapped in a stable foam, which cannot be eructated. Unlike free-gas bloat, passing a stomach tube or using a trocar is often ineffective because the foam will quickly block the opening. The definitive treatment is to administer an anti-foaming (surfactant) agent, like poloxalene or mineral oil, directly into the rumen via a stomach tube. This agent breaks down the surface tension of the foam, destabilizing it and allowing the gas to coalesce and be eructated.

Question 22: A 5-month-old Great Dane presents with a fever, lethargy, and painful, swollen metaphyses of the long bones. Radiographs of the distal radius and ulna reveal irregular radiolucent lines in the metaphyses, parallel to the physes, sometimes referred to as a 'double physis sign'. What is the most likely diagnosis?

Retained ulnar cartilage core
Panosteitis
Osteochondritis dissecans (OCD)
Hypertrophic osteodystrophy (HOD) (Correct answer)

Correct answer: Hypertrophic osteodystrophy (HOD)

The signalment (young, giant-breed dog), clinical signs (fever, bone pain, swollen metaphyses), and classic radiographic finding of a radiolucent line in the metaphysis parallel to the physis ('double physis sign') are all characteristic of hypertrophic osteodystrophy (HOD). Panosteitis appears as shifting leg lameness with increased intramedullary opacities. Retained ulnar cartilage cores show a persistent radiolucent cone in the distal ulnar metaphysis. OCD involves a cartilage flap or defect, typically on an articular surface.

Question 23: What training is necessary to become a veterinarian technician?

High school diploma
Associates degree (Correct answer)
Doctor of Medicine

Correct answer: Associates degree

To become a certified or licensed veterinary technician, individuals typically need to complete an Associate of Science (AS) or Associate of Applied Science (AAS) degree. These accredited programs provide the necessary theoretical knowledge and practical skills required for the profession.

Question 24: Which of the following zoonotic diseases is correctly matched with its primary animal reservoir in the United States?

Plague (Yersinia pestis) — white-tailed deer
Hantavirus pulmonary syndrome — deer mice (Peromyscus maniculatus) (Correct answer)
West Nile virus — domestic dogs
Trichinellosis — cattle

Correct answer: Hantavirus pulmonary syndrome — deer mice (Peromyscus maniculatus)

Deer mice (Peromyscus maniculatus) are the primary reservoir for Sin Nombre virus, the agent of hantavirus pulmonary syndrome in the US.

Question 25: A dog is presented to the emergency clinic after ingesting an unknown quantity of an anticoagulant rodenticide approximately 2 hours ago. The dog is currently asymptomatic. Which of the following therapeutic plans is most appropriate for immediate management?

Induce emesis, administer activated charcoal, and begin Vitamin K1 therapy. (Correct answer)
Administer a fresh frozen plasma transfusion and monitor for signs of bleeding.
Perform baseline coagulation testing and start Vitamin K1 only if values are abnormal.
Administer Vitamin K1 immediately and discharge with a 4-week course of the same.

Correct answer: Induce emesis, administer activated charcoal, and begin Vitamin K1 therapy.

For a recent (within 2-4 hours) ingestion of an anticoagulant rodenticide, the primary goal is decontamination to prevent absorption. This is best achieved by inducing emesis followed by administering activated charcoal to bind any remaining toxin. Although the dog is asymptomatic, the peak effect of these toxins is delayed 3-5 days, so initiating the antidote, Vitamin K1, is crucial to counteract the inhibition of clotting factor synthesis. Waiting for clinical signs or abnormal coagulation times is inappropriate, and transfusions are only indicated if the animal is actively bleeding.

Question 26: A puppy presents with intussusception confirmed via ultrasound. Which predisposing condition should be ruled out after surgical correction?

Hepatic lipidosis
Pancreatitis
Urinary tract infection
Parvoviral enteritis (Correct answer)

Correct answer: Parvoviral enteritis

Canine parvovirus causes severe enteritis and hypermotility that predisposes puppies to intussusception, and its presence determines additional management.

Question 27: What is the recommended management of a sequestrum following a long-bone fracture in cattle?

Hyperbaric oxygen therapy
Surgical removal of the necrotic bone fragment (Correct answer)
Intramedullary pinning to stabilize the fragment
Systemic antibiotics alone until resolution

Correct answer: Surgical removal of the necrotic bone fragment

A bone sequestrum is avascular necrotic bone that cannot be reached by antibiotics; surgical debridement and removal of the sequestrum is required for resolution of the infection.

Question 28: A local wildlife rehabilitator is concerned after finding a "raccoon latrine" in a children's play area. You advise on the serious risk of neural larva migrans in humans, which can be caused by the ingestion of eggs from which parasite?

Trichinella spiralis
Ancylostoma caninum
Baylisascaris procyonis (Correct answer)
Toxocara canis

Correct answer: Baylisascaris procyonis

*Baylisascaris procyonis*, the raccoon roundworm, is a well-documented cause of severe and often fatal neural larva migrans (NLM), as well as ocular and visceral larva migrans in humans and other animals. Raccoons are the definitive host and often defecate in communal latrines, leading to heavy environmental contamination with eggs. The larvae of *B. procyonis* are particularly dangerous because they are large, aggressive, and continue to grow as they migrate through the central nervous system. While *Toxocara canis* (dog roundworm) can also cause larva migrans, *B. procyonis* is uniquely associated with raccoons and is known for causing more severe neurologic disease.

Question 29: How long does it take to become a veterinarian?

4-5 years
2 years
7-9 years (Correct answer)
1 year

Correct answer: 7-9 years

Becoming a veterinarian requires extensive education, typically involving a 4-year undergraduate degree followed by a 4-year Doctor of Veterinary Medicine (DVM) program. This totals approximately 8 years of post-secondary education, with some individuals taking longer for prerequisites or specialized training.

Question 30: Hendra virus spillover events in Australia primarily involve which reservoir host and which intermediate species?

Rodents → horses → humans
Fruit bats (Pteropus spp.) → horses → humans (Correct answer)
Birds → pigs → humans
Bats → cattle → humans

Correct answer: Fruit bats (Pteropus spp.) → horses → humans

Hendra virus is maintained in Pteropus fruit bats and spills over to horses, which then serve as amplifying hosts for human infection.

Question 31: The most common cause of early embryonic mortality in cattle is considered to be:

Subclinical uterine infections present at the time of AI
Chromosomal abnormalities in the conceptus
Failure of maternal recognition of pregnancy due to inadequate interferon-tau (IFN-τ) production (Correct answer)
Luteal phase deficiency resulting in insufficient progesterone support

Correct answer: Failure of maternal recognition of pregnancy due to inadequate interferon-tau (IFN-τ) production

Failure of maternal recognition of pregnancy, caused by insufficient IFN-τ from the trophoblast to prevent endometrial PGF2α secretion, is the leading cause of early embryonic loss in cattle.

Question 32: Which of the following is NOT a common cause or contributing factor for the development of chronic kidney disease (CKD) in cats?

High-protein diet in a healthy adult cat (Correct answer)
Hypertension
Pyelonephritis
Polycystic kidney disease (PKD)

Correct answer: High-protein diet in a healthy adult cat

While therapeutic renal diets for cats with established CKD are protein-restricted, a high-protein diet in a healthy cat with normal kidney function has not been shown to cause CKD. Common causes and contributors include genetic conditions like Polycystic Kidney Disease, bacterial kidney infections (pyelonephritis), and high blood pressure (hypertension), which can damage the kidneys over time.

Question 33: A Standardbred trotter is presented for bilateral hindlimb weakness and muscle wasting. EMG reveals abnormal spontaneous activity in epaxial muscles. PSSM-2 testing is negative. Which condition should be considered?

Equine protozoal myeloencephalitis (EPM)
Equine degenerative myeloencephalopathy (EDM)
Equine motor neuron disease (EMND) (Correct answer)
Hyperkalemic periodic paralysis (HYPP)

Correct answer: Equine motor neuron disease (EMND)

Equine motor neuron disease causes lower motor neuron signs with muscle atrophy, abnormal EMG, and is associated with vitamin E deficiency; retinal pigment changes are pathognomonic.

Question 34: Monkey B virus (Macacine herpesvirus 1) is an occupational hazard for which group, and what is the case fatality rate in untreated human infections?

Primate sanctuary volunteers; approximately 15% fatality rate
Zoo visitors; approximately 5% fatality rate
Veterinary surgeons performing macaque procedures; approximately 30% fatality rate
Macaque handlers and laboratory workers; approximately 70-80% fatality rate (Correct answer)

Correct answer: Macaque handlers and laboratory workers; approximately 70-80% fatality rate

B virus causes encephalomyelitis in humans with a 70-80% fatality rate if untreated; macaque handlers and laboratory workers are at primary risk through bites, scratches, or mucosal splash.

Question 35: A veterinarian performing a necropsy on a cow that died acutely without premonitory signs in an anthrax-endemic region should FIRST:

Open the carcass immediately to collect diagnostic samples
Examine a blood smear from a peripheral vessel BEFORE opening the carcass (Correct answer)
Administer antibiotics to all farm personnel before beginning the necropsy
Submit the entire carcass to a diagnostic laboratory for full necropsy

Correct answer: Examine a blood smear from a peripheral vessel BEFORE opening the carcass

In suspected anthrax, opening the carcass is contraindicated as it exposes spores to oxygen and promotes sporulation; a peripheral blood smear should be examined first to confirm Bacillus anthracis.

Question 36: A dog receiving a morphine CRI post-surgery develops respiratory depression (rate 4 breaths/min). What is the CORRECT reversal agent and dose strategy?

Naloxone titrated IV in small incremental doses (Correct answer)
Flumazenil IV bolus
Atipamezole at full reversal dose IM
Yohimbine IV at 0.1 mg/kg

Correct answer: Naloxone titrated IV in small incremental doses

Naloxone is the opioid antagonist of choice; small incremental IV doses reverse respiratory depression while minimizing the risk of acute pain and cardiovascular excitation.

Question 37: A 4-year-old male neutered Standard Poodle presents in a state of collapse. Bloodwork reveals a Na:K ratio of 21:1, azotemia, and hypoglycemia. Which of the following is the most likely diagnosis?

Diabetic ketoacidosis
Acute renal failure
Hypoadrenocorticism (Addison's disease) (Correct answer)
Severe gastrointestinal disease

Correct answer: Hypoadrenocorticism (Addison's disease)

The classic electrolyte abnormalities for hypoadrenocorticism are hyponatremia and hyperkalemia, which result in a low sodium-to-potassium (Na:K) ratio, typically below 27:1. The combination of these electrolyte changes with collapse, azotemia, and hypoglycemia in a predisposed breed makes Addison's disease the top differential.

Question 38: Which nerve is at greatest risk during a standing flank laparotomy in cattle?

Iliohypogastric and ilioinguinal nerves (Correct answer)
Femoral nerve
Obturator nerve
Sciatic nerve

Correct answer: Iliohypogastric and ilioinguinal nerves

The iliohypogastric and ilioinguinal nerves run parallel to the flank incision and can be damaged, causing paralysis of the flank musculature.

Question 39: A 7-year-old cat with a known history of hypertrophic cardiomyopathy (HCM) requires anesthesia for a full-mouth dental extraction. Which of the following induction agents should be used with the most caution due to its sympathomimetic effects, which increase heart rate and myocardial oxygen demand?

Etomidate
Propofol
Ketamine (Correct answer)
Alfaxalone

Correct answer: Ketamine

Ketamine is a dissociative anesthetic that causes catecholamine release, leading to increased heart rate, blood pressure, and cardiac output. In a cat with HCM, where the ventricular muscle is thickened and diastolic function is impaired, this increased myocardial oxygen demand can be detrimental and may lead to arrhythmias or cardiac decompensation. Alfaxalone, propofol, and etomidate generally have less impact on heart rate or may cause a decrease, making them safer choices in this scenario.

Question 40: A 12-year-old dog with mitral valve disease (MMVD) requires anesthesia for tooth extraction. Which induction protocol is MOST appropriate?

Propofol IV titrated to effect after premedication (Correct answer)
Thiopental IV bolus
Mask induction with isoflurane for rapid control
Ketamine/diazepam IV combination

Correct answer: Propofol IV titrated to effect after premedication

Propofol titrated IV allows careful dose adjustment to minimize cardiovascular depression in a compromised patient; mask induction causes stress and uncontrolled changes in depth.

Question 41: Which antibiotic is commonly administered intraperitoneally during equine colic surgery to reduce the risk of peritonitis?

Ampicillin
Oxytetracycline
Penicillin G
Gentamicin (Correct answer)

Correct answer: Gentamicin

Gentamicin is frequently diluted in saline and lavaged into the peritoneal cavity during and after equine abdominal surgery to reduce gram-negative bacterial contamination and the risk of peritonitis.

Question 42: In cattle, which technique is used to surgically correct a displaced abomasum from the left flank while the animal is standing?

Right flank pyloropexy
Ventral midline approach under general anesthesia
Left flank laparotomy with omentopexy or abomasopexy (Correct answer)
Blind stitch (toggle-pin suture) only

Correct answer: Left flank laparotomy with omentopexy or abomasopexy

Left flank laparotomy allows the surgeon to decompress the abomasum, return it to the correct position, and fix it by omental or abomasal suture to the right abdominal wall to prevent recurrence.

Question 43: In cryptorchid horses, the retained abdominal testicle:

Functions normally if the contralateral testicle is also retained
Produces testosterone normally but fails to produce fertile sperm due to elevated intra-abdominal temperature (Correct answer)
Produces neither testosterone nor sperm, making the horse completely infertile
Fails to produce testosterone due to disrupted hypothalamic-pituitary signaling

Correct answer: Produces testosterone normally but fails to produce fertile sperm due to elevated intra-abdominal temperature

The retained testicle in cryptorchid stallions maintains normal endocrine (testosterone) function but cannot produce viable sperm because spermatogenesis requires scrotal temperatures approximately 2–4°C below core body temperature.

Question 44: Which local anesthetic has the longest duration of action and is most cardiotoxic in overdose?

Bupivacaine (Correct answer)
Lidocaine
Procaine
Mepivacaine

Correct answer: Bupivacaine

Bupivacaine provides the longest duration of local anesthesia but binds cardiac sodium channels with high affinity, making cardiac resuscitation after toxicity extremely difficult.

Question 45: Which of the following scenarios is the primary indication for using an ACTH stimulation test over a low-dose dexamethasone suppression test (LDDST) when diagnosing hyperadrenocorticism (Cushing's disease) in a dog?

The dog has concurrent diabetes mellitus.
To differentiate between pituitary-dependent and adrenal-dependent Cushing's.
The owner has significant financial constraints.
The dog has a history of recent, high-dose corticosteroid administration. (Correct answer)

Correct answer: The dog has a history of recent, high-dose corticosteroid administration.

The ACTH stimulation test is the test of choice for diagnosing iatrogenic hyperadrenocorticism, which is caused by the administration of exogenous corticosteroids. In this situation, the adrenal glands will be atrophied and will show a blunted or minimal response to ACTH stimulation. The LDDST is unreliable in these cases. While both tests can be affected by concurrent illness like diabetes, the LDDST is generally preferred for screening naturally occurring Cushing's due to its higher sensitivity. The LDDST, not the ACTH stim test, can sometimes help differentiate between pituitary and adrenal causes.

Question 46: Which of the following is the primary reason that NSAIDs (e.g., flunixin meglumine) are used in the treatment of endotoxemia in cattle, rather than solely for analgesia?

They directly neutralize circulating lipopolysaccharide (LPS)
They block TNF-alpha receptor binding
They stimulate hepatic LPS clearance via Kupffer cells
They inhibit cyclooxygenase, reducing prostaglandin and thromboxane production triggered by endotoxin (Correct answer)

Correct answer: They inhibit cyclooxygenase, reducing prostaglandin and thromboxane production triggered by endotoxin

Flunixin inhibits COX enzymes, reducing prostaglandin E2 and thromboxane A2 production that mediate the systemic inflammatory response to endotoxin, including fever, vasodilation, and coagulopathy.

Question 47: The investigation of illness origins is:

Pathology
Toxicology
Etiology (Correct answer)
Biology

Correct answer: Etiology

Etiology is the branch of medical science that deals with the causes and origins of diseases or conditions. It involves identifying the factors, such as pathogens, genetic predispositions, or environmental influences, that contribute to the development of an illness. Understanding etiology is crucial for effective diagnosis, treatment, and prevention strategies.

Question 48: A horse under general anesthesia develops hypotension (MAP < 60 mmHg). After ensuring adequate depth of anesthesia, what is the FIRST-LINE treatment?

IV crystalloid fluid bolus (Correct answer)
Epinephrine IV bolus
Increase isoflurane concentration
Dobutamine CRI

Correct answer: IV crystalloid fluid bolus

IV fluid bolus is the first-line intervention to restore preload and correct anesthesia-induced vasodilation or hypovolemia before adding inotropes.

Question 49: The minimum number of organisms necessary to cause infection reveals

Susceptibility
Virulence
Pathogenicity
Infectivity (Correct answer)

Correct answer: Infectivity

Infectivity refers to the ability of a pathogen to establish an infection in a host, and it is often quantified by the infectious dose (ID50). This is the minimum number of organisms required to cause infection in 50% of exposed individuals. This concept helps characterize how easily a pathogen can initiate disease, distinguishing it from virulence (severity) or pathogenicity (general ability to cause disease).

Question 50: During a celiotomy in a cow, rumenotomy is performed. Which anesthetic technique is most appropriate for a standing cow undergoing this procedure?

Inhalant anesthesia with endotracheal intubation
Paravertebral or proximal paravertebral nerve block combined with local infiltration (Correct answer)
Total intravenous anesthesia with propofol CRI
Epidural morphine alone

Correct answer: Paravertebral or proximal paravertebral nerve block combined with local infiltration

Standing flank surgery in cattle is routinely performed under paravertebral nerve block or inverted-L block with local infiltration, avoiding the risks of general anesthesia recumbency in ruminants.

Question 51: Leptospirosis transmission to veterinary staff most commonly occurs through which route?

Ingestion of leptospires from contaminated food
Respiratory inhalation of Leptospira aerosols in enclosed spaces
Arthropod vector (tick or flea) biting an infected animal then a human
Contact of mucous membranes or abraded skin with urine of infected animals (Correct answer)

Correct answer: Contact of mucous membranes or abraded skin with urine of infected animals

Leptospires penetrate through mucous membranes or skin abrasions upon contact with urine or urine-contaminated fluids, making urogenital procedures and urine handling highest risk.

Question 52: Which drug class is used as a constant rate infusion (CRI) to provide balanced anesthesia and reduce inhalant requirements via the concept of multimodal analgesia?

Loop diuretics
Anticholinergics
Phenothiazines
NMDA receptor antagonists (Correct answer)

Correct answer: NMDA receptor antagonists

NMDA receptor antagonists such as ketamine CRI reduce the MAC of inhalants and prevent central sensitization as part of multimodal analgesia.

Question 53: Which of the following best describes the pathophysiology of 'hardware disease' (traumatic reticuloperitonitis) in cattle?

Volvulus of the reticulum on its mesentery
Ingested metallic foreign body penetrates the reticulum wall causing peritonitis (Correct answer)
Viral inflammation of the forestomachs
Bacterial infection of the rumen wall

Correct answer: Ingested metallic foreign body penetrates the reticulum wall causing peritonitis

Hardware disease occurs when ingested metal (wire, nails) penetrates the reticulum, causing localized or diffuse peritonitis; a magnet placed in the reticulum is the standard prevention.

Question 54: The Ovsynch protocol in cattle achieves synchronized, fixed-time artificial insemination by:

Repeated FSH injections for superovulation followed by a single LH injection
Melatonin administration to manipulate photoperiod and reset the cycle
Progesterone implant for 7 days followed by estradiol benzoate to synchronize estrus
GnRH injection to initiate a new follicular wave, followed by PGF2α to lyse the CL, then a second GnRH to induce ovulation (Correct answer)

Correct answer: GnRH injection to initiate a new follicular wave, followed by PGF2α to lyse the CL, then a second GnRH to induce ovulation

Ovsynch uses GnRH (day 0) to synchronize a follicular wave, PGF2α (day 7) to regress the CL, and a second GnRH (day 9) to induce synchronized ovulation ~16 hours later for timed AI.

Question 55: A horse has pleural fluid analysis showing a cloudy yellow effusion with total protein 5.0 g/dL, nucleated cells 25,000/µL, and intracellular bacteria on cytology. What is the diagnosis?

Septic pleuritis (pleuropneumonia) (Correct answer)
Hemothorax
Chylothorax
Transudative heart failure

Correct answer: Septic pleuritis (pleuropneumonia)

High protein, markedly elevated neutrophil counts, and intracellular bacteria in equine pleural fluid confirm septic pleuritis, most often due to Streptococcus or Pasteurella spp.

Question 56: What is the primary metabolic reason that most non-steroidal anti-inflammatory drugs (NSAIDs) must be used with extreme caution and at specific, validated doses and intervals in cats?

They have a relative deficiency in the hepatic enzyme glucuronyl transferase. (Correct answer)
They are unable to produce protective prostaglandins in the stomach.
They are highly susceptible to NSAID-induced hepatotoxicity.
They frequently develop severe gastric ulceration after a single dose.

Correct answer: They have a relative deficiency in the hepatic enzyme glucuronyl transferase.

Cats have a relative deficiency in the hepatic enzyme UDP-glucuronosyltransferase (UGT), which is essential for glucuronidation, a major pathway for metabolizing and eliminating many drugs, including most NSAIDs. This metabolic difference results in a significantly prolonged drug half-life, increasing the risk of accumulation and toxicity (especially renal and gastrointestinal) if dosing is not appropriate.

Question 57: A feline patient's chemistry panel shows a marked elevation in alanine aminotransferase (ALT) and aspartate aminotransferase (AST), with only a mild increase in alkaline phosphatase (ALP) and gamma-glutamyl transferase (GGT). This pattern is most indicative of what type of liver pathology?

Glucocorticoid-induced hepatopathy.
Post-hepatic biliary obstruction.
Hepatocellular leakage or injury. (Correct answer)
Cholestasis.

Correct answer: Hepatocellular leakage or injury.

ALT and AST are considered hepatocellular leakage enzymes because they are primarily located within the cytoplasm of hepatocytes. Significant elevations point towards direct damage or death of the liver cells, causing the enzymes to leak into the bloodstream. In contrast, ALP and GGT are primarily cholestatic enzymes, and their marked elevation would suggest a problem with bile flow.

Question 58: What is the Coggins test used to detect in horses?

Strangles (Streptococcus equi)
Equine herpesvirus 1
Equine infectious anemia (Correct answer)
West Nile virus

Correct answer: Equine infectious anemia

The Coggins test (agar gel immunodiffusion) detects antibodies to equine infectious anemia virus (EIAV) and is required for interstate transport of horses.

Question 59: A 10-kg dog undergoing anesthesia has an ETCO2 of 55 mmHg. The appropriate intervention is:

Increase inspired oxygen concentration
Increase respiratory rate or tidal volume (Correct answer)
Administer doxapram
Administer sodium bicarbonate IV

Correct answer: Increase respiratory rate or tidal volume

Elevated ETCO2 (hypercapnia) indicates hypoventilation; increasing minute ventilation by raising rate or tidal volume will lower CO2 elimination.

Question 60: Which equine lameness condition is associated with degenerative joint disease of the distal interphalangeal joint and navicular bone?

Laminitis
Sidebone
Navicular syndrome (Correct answer)
Ringbone

Correct answer: Navicular syndrome

Navicular syndrome (podotrochlear disease) involves degenerative changes affecting the navicular bone, associated ligaments, and bursa within the hoof.

Question 61: A 9-year-old feline patient with known hypertrophic cardiomyopathy (HCM) requires anesthesia for multiple dental extractions. Which of the following drugs should be used with extreme caution or avoided as part of the anesthetic protocol due to its sympathomimetic effects, which increase heart rate and myocardial oxygen demand?

Meloxicam
Ketamine (Correct answer)
Lidocaine (as a dental block)
Buprenorphine

Correct answer: Ketamine

Ketamine causes a release of catecholamines, leading to sympathomimetic effects such as increased heart rate, blood pressure, and myocardial oxygen demand. These effects can be detrimental in a cat with hypertrophic cardiomyopathy (HCM), a condition characterized by a thickened, stiff ventricle where increased heart rate can worsen diastolic dysfunction and potentially exacerbate outflow tract obstruction. Buprenorphine, meloxicam (with care), and local lidocaine are generally considered safer choices.

Question 62: A dog has a serum calcium of 14.5 mg/dL and a PTH-rP level that is markedly elevated. What is the most likely diagnosis?

Primary hyperparathyroidism
Humoral hypercalcemia of malignancy (Correct answer)
Hypoadrenocorticism
Vitamin D toxicosis

Correct answer: Humoral hypercalcemia of malignancy

PTH-related protein (PTH-rP) is secreted by neoplasms (commonly anal sac apocrine gland adenocarcinoma and lymphoma) and is the leading cause of humoral hypercalcemia of malignancy.

Question 63: Which analgesic is contraindicated in cats due to their deficiency in glucuronyl transferase enzymes and risk of fatal toxicity?

Buprenorphine
Meloxicam
Acetaminophen (Correct answer)
Tramadol

Correct answer: Acetaminophen

Cats lack adequate glucuronyl transferase to metabolize acetaminophen, leading to methemoglobinemia, hepatotoxicity, and death at doses safe for other species.

Question 64: Doxorubicin is a common chemotherapeutic agent used in veterinary oncology. Which of the following is a well-documented, cumulative, and often dose-limiting cardiotoxicity specifically associated with this drug in dogs?

Valvular endocardiosis
Acute arrhythmogenic toxicity
Pericardial effusion
Dilated cardiomyopathy (DCM) (Correct answer)

Correct answer: Dilated cardiomyopathy (DCM)

Doxorubicin is known to cause a cumulative, dose-dependent cardiotoxicity in dogs that manifests as dilated cardiomyopathy (DCM). The damage to the myocardium is caused by free radical formation and oxidative stress. This is why a patient's cumulative lifetime dose is carefully tracked, and cardiac evaluations are often performed. While acute arrhythmias can occur during infusion, the chronic, dose-limiting toxicity that leads to heart failure is DCM.

Question 65: A 12-year-old Quarter Horse is diagnosed with navicular syndrome based on clinical signs and a positive palmar digital nerve block. Which of the following is NOT a classic radiographic finding associated with this condition?

Widening of the distal interphalangeal (coffin) joint space. (Correct answer)
Enlarged, lollipop-shaped synovial invaginations on the distal border of the navicular bone.
Sclerosis of the medullary cavity of the navicular bone.
Enthesophyte formation on the proximal border of the navicular bone.

Correct answer: Widening of the distal interphalangeal (coffin) joint space.

Classic radiographic signs of navicular syndrome involve changes to the navicular bone itself, such as enlarged vascular channels (synovial invaginations), medullary sclerosis, flexor cortex erosions, and enthesophyte formation at ligament attachments. Widening of the coffin joint space is not a feature of navicular syndrome; it would be more indicative of joint effusion, synovitis, or instability unrelated to this specific diagnosis.

Question 66: On cytology of a lymph node aspirate, you observe a monomorphic population of large lymphocytes with prominent nucleoli comprising >80% of cells. What is the most likely diagnosis?

Lymphoma (Correct answer)
Granulomatous lymphadenitis
Suppurative lymphadenitis
Reactive lymphoid hyperplasia

Correct answer: Lymphoma

A monomorphic population of large, atypical lymphocytes exceeding 80% of the cell population is highly indicative of lymphoma.

Question 67: Which vaccine component is most important for preventing type C enterotoxemia (overeating disease) in sheep?

Clostridium tetani toxoid
Clostridium perfringens types C and D toxoid combined (Correct answer)
Clostridium perfringens type C toxoid
Clostridium perfringens type D toxoid

Correct answer: Clostridium perfringens types C and D toxoid combined

CDT vaccine (Clostridium perfringens types C and D plus tetanus toxoid) is the core small ruminant vaccine, providing protection against overeating disease and tetanus.

Question 68: In cattle, what is the average length of the estrous cycle?

28 days
21 days (Correct answer)
14 days
35 days

Correct answer: 21 days

The bovine estrous cycle averages 21 days (range 18–24 days), which is the standard interval used in synchronization and breeding management protocols.

Question 69: When does a dog go into estrus?

Between 7-28 days with a mean of 11 days
Exactly 6 days
Between 4-21 days with a mean of 19 days (Correct answer)
Exactly 15 days

Correct answer: Between 4-21 days with a mean of 19 days

Estrus, commonly known as 'heat,' is the period when a female dog is receptive to mating. While the duration can vary significantly among individual dogs, the typical range for estrus is indeed between 4 and 21 days, with an average duration of about 19 days. This period is characterized by specific hormonal changes and behavioral signs.

Question 70: Which animal has a unique dental formula that includes no upper incisors and instead has a dental pad?

Cat
Dog
Horse
Cow (Correct answer)

Correct answer: Cow

Cattle (ruminants) lack upper incisors and have a hard dental pad in their place, using a scooping motion to graze.

Question 71: Do veterinarians bandage injuries?

No
Yes (Correct answer)

Correct answer: Yes

Yes, veterinarians regularly bandage injuries as a common and essential part of animal medical care. Bandaging is used to protect wounds, support injured limbs, control bleeding, and aid in the healing process for a wide variety of animal patients.

Question 72: Which nociceptive pathway is PRIMARILY responsible for the slow, burning, poorly localized pain associated with tissue inflammation?

C fibers via the spinothalamic tract (Correct answer)
A-delta fibers via the spinothalamic tract
A-alpha fibers via the corticospinal tract
A-beta fibers via the dorsal column-medial lemniscal pathway

Correct answer: C fibers via the spinothalamic tract

Unmyelinated C fibers transmit slow, burning, diffuse pain from tissue inflammation via the spinothalamic tract to the thalamus and cortex.

Question 73: Which ligament must be transected during a standing bovine caesarean section via the left paralumbar flank?

Broad ligament of the uterus (Correct answer)
Round ligament of the uterus
Intercornual ligament
Lateral suspensory ligament of the udder

Correct answer: Broad ligament of the uterus

The broad ligament may need to be partially incised to exteriorize the gravid uterine horn through the flank incision during caesarean section in cattle.

Question 74: Marek's disease in poultry is best prevented through which approach?

Treatment with antiviral medications at first clinical signs
Vaccination of day-old chicks in the hatchery combined with management practices (Correct answer)
Antibiotic supplementation in feed
Depopulation of all flocks showing any neurological signs

Correct answer: Vaccination of day-old chicks in the hatchery combined with management practices

Vaccination of day-old chicks at the hatchery with herpesvirus of turkeys (HVT) or bivalent vaccines is the cornerstone of Marek's disease prevention, as the vaccine prevents tumor formation but not infection.

Question 75: Which of the following is the correct dosing frequency for melarsomine dihydrochloride (Immiticide) using the split-dose protocol for heartworm treatment in dogs?

One injection, rest 30 days, then two injections 24 hours apart (Correct answer)
Single injection repeated every 6 months
Three injections given weekly
Two injections given 24 hours apart only

Correct answer: One injection, rest 30 days, then two injections 24 hours apart

The AHS-recommended split-dose protocol involves one IM injection, a 30-day rest, then two injections 24 hours apart to reduce the risk of pulmonary thromboembolic complications.

Question 76: Which of the following statements regarding extra-label drug use (ELDU) in food-producing animals in the United States is correct?

ELDU is permitted for production purposes, such as improving feed efficiency.
A veterinarian may use a drug extra-label if it is more cost-effective than the approved labeled drug.
Phenylbutazone is prohibited from extra-label use in female dairy cattle 20 months of age or older. (Correct answer)
It is permissible to use any approved human drug in a food animal if a veterinarian deems it necessary.

Correct answer: Phenylbutazone is prohibited from extra-label use in female dairy cattle 20 months of age or older.

The Animal Medicinal Drug Use Clarification Act (AMDUCA) strictly regulates ELDU in food animals to protect the human food supply. Several drugs are explicitly prohibited from ELDU in certain species due to public health risks. Phenylbutazone is banned for ELDU in female dairy cattle 20 months of age or older because of the risk of residues causing aplastic anemia in humans. ELDU is not permitted for cost reasons or for production purposes, and there are restrictions on using human drugs if an approved animal drug can be used instead.

Question 77: Cutaneous larva migrans ('creeping eruption') in beach-going humans is most commonly caused by which organism?

Baylisascaris procyonis
Ancylostoma braziliense (cat/dog hookworm) (Correct answer)
Toxoplasma gondii
Strongyloides stercoralis

Correct answer: Ancylostoma braziliense (cat/dog hookworm)

Ancylostoma braziliense larvae penetrate human skin but cannot complete their life cycle, migrating through the epidermis and causing the characteristic serpiginous track.

Question 78: A dog from Connecticut presents with shifting leg lameness, fever, and lethargy. A point-of-care ELISA test is positive for antibodies to Borrelia burgdorferi. This zoonotic disease, Lyme disease, is transmitted by a specific vector. Which of the following is the primary vector for Lyme disease in the northeastern United States?

Amblyomma americanum (Lone star tick)
Ctenocephalides felis (Cat flea)
Dermacentor variabilis (American dog tick)
Ixodes scapularis (Black-legged or deer tick) (Correct answer)

Correct answer: Ixodes scapularis (Black-legged or deer tick)

*Borrelia burgdorferi*, the causative agent of Lyme disease, is primarily transmitted by the black-legged tick, *Ixodes scapularis*, in the northeastern and midwestern United States. *Dermacentor variabilis* transmits Rocky Mountain spotted fever, and *Amblyomma americanum* is associated with ehrlichiosis and alpha-gal syndrome. Fleas are vectors for other diseases like plague and bartonellosis but not Lyme disease.

Question 79: Do veterinary technicians or assistants earn more money?

None of the above
Vet assistant
Vet technician (Correct answer)

Correct answer: Vet technician

Veterinary technicians generally earn more than veterinary assistants due to their higher level of education, specialized training, and broader scope of responsibilities. Technicians typically hold an Associate's degree and perform more complex medical tasks, while assistants usually require less formal education.

Question 80: Which of the following zoonotic diseases is classified as a CDC Category A bioterrorism agent AND is naturally transmitted from animals to humans?

Leptospirosis
Psittacosis
Anthrax (Bacillus anthracis) (Correct answer)
Salmonellosis

Correct answer: Anthrax (Bacillus anthracis)

Bacillus anthracis is a Category A bioterrorism agent that naturally infects livestock and can be transmitted to humans via contact, ingestion, or inhalation.

Question 81: A dog is in Trendelenburg position during abdominal surgery. Which physiologic consequence is most likely?

Decreased venous return
Decreased cardiac preload
Increased intracranial pressure (Correct answer)
Hypercapnia from reduced minute ventilation

Correct answer: Increased intracranial pressure

Trendelenburg (head-down) position shifts abdominal contents cranially and increases intracranial pressure by impeding venous drainage from the head.

Question 82: Wound closure by second intention (healing by granulation) is most appropriate for which of the following scenarios in a dog?

A clean laceration over the thorax less than 6 hours old
An elective flank incision after splenectomy
A fresh bite wound on the neck with moderate tissue loss
A heavily contaminated degloving injury of the distal limb (Correct answer)

Correct answer: A heavily contaminated degloving injury of the distal limb

Heavily contaminated wounds with significant tissue loss are best managed by open wound care and second-intention healing to avoid sealing infection under a primary closure.

Question 83: Which nerve block, performed at the infraorbital foramen, provides analgesia for maxillary dental procedures in dogs?

Infraorbital nerve block (Correct answer)
Mental nerve block
Maxillary nerve block at the pterygomaxillary fissure
Inferior alveolar nerve block

Correct answer: Infraorbital nerve block

Blocking the infraorbital nerve at the foramen desensitizes the ipsilateral upper premolars, canine, incisors, and adjacent soft tissues for maxillary dental procedures.

Question 84: A cow presents with right-sided ping on auscultation-percussion between ribs 9-12, decreased milk production, and anorexia. What is the most likely diagnosis?

Rumen tympany
Right displacement of the abomasum (Correct answer)
Cecal dilation/volvulus
Left displacement of the abomasum

Correct answer: Right displacement of the abomasum

Right displacement of the abomasum produces a characteristic 'ping' on auscultation-percussion over the right paralumbar fossa and is associated with decreased production and inappetence.

Question 85: A 14-year-old cat with stable chronic kidney disease (IRIS Stage 2) and painful osteoarthritis requires long-term analgesia. Which of the following non-steroidal anti-inflammatory drugs (NSAIDs) is generally considered to have a favorable safety profile and is licensed for long-term use in cats for this purpose in many regions?

Meloxicam
Carprofen
Deracoxib
Robenacoxib (Correct answer)

Correct answer: Robenacoxib

Robenacoxib is a highly COX-2 selective NSAID. Its pharmacokinetic profile in cats, including a short half-life in the blood but persistence at the site of inflammation, contributes to a favorable safety profile. Studies have shown it can be used with appropriate monitoring in cats with stable, early-stage chronic kidney disease. Carprofen and Deracoxib are not typically used for long-term pain management in cats. While Meloxicam is also used, Robenacoxib is a well-supported choice for long-term management of OA in cats, including those with stable comorbidities.

Question 86: Superovulation in cattle for embryo transfer is most commonly induced by:

Progesterone implants to increase the number of implantation sites
Exogenous FSH or eCG administered during the mid-luteal phase to stimulate multiple follicle development (Correct answer)
GnRH administration on day 7 to recruit additional follicles
Surgical removal of one ovary to concentrate follicular stimulation

Correct answer: Exogenous FSH or eCG administered during the mid-luteal phase to stimulate multiple follicle development

Multiple ovulations for embryo transfer are induced by exogenous FSH (given in decreasing doses over 4 days) or a single eCG injection during the mid-luteal phase, resulting in several transferable embryos.

Question 87: A veterinarian is asked to advise on controlling Salmonella in a commercial poultry flock. Which intervention is MOST effective at the population level?

Vitamin supplementation only
Routine prophylactic antibiotic use in feed
Increased stocking density to promote natural immunity
Competitive exclusion products combined with vaccination (Correct answer)

Correct answer: Competitive exclusion products combined with vaccination

Competitive exclusion products introduce beneficial microflora that outcompete Salmonella, and when combined with vaccination, provide the most effective population-level control.

Question 88: Cat scratch disease (CSD) is caused by Bartonella henselae. Which clinical scenario represents the HIGHEST risk for severe or systemic disease?

An HIV-positive adult scratched by a flea-infested kitten developing bacillary angiomatosis (Correct answer)
A healthy 10-year-old scratched by a kitten developing a local lymphadenopathy
A veterinarian bitten by an adult cat with regional lymph node swelling
A healthy adult developing Parinaud's oculoglandular syndrome after kitten exposure

Correct answer: An HIV-positive adult scratched by a flea-infested kitten developing bacillary angiomatosis

Bartonella henselae causes bacillary angiomatosis—a severe, disseminated vascular proliferative disease—in immunocompromised individuals, particularly those with HIV/AIDS.

Question 89: Which of the following correctly describes the role of the National Animal Health Reporting System (NAHRS) in US veterinary preventive medicine?

It mandates treatment protocols for all reportable diseases
It regulates the approval process for veterinary biologics
It collects and reports state-level data on animal diseases to the OIE/WOAH to maintain US trade status (Correct answer)
It sets vaccination schedules for all food animal species

Correct answer: It collects and reports state-level data on animal diseases to the OIE/WOAH to maintain US trade status

NAHRS is a voluntary cooperative program that collects state-level animal disease data and reports to the World Organisation for Animal Health (WOAH/OIE), supporting US market access and trade.

Question 90: What is the primary mechanism of action for the antiemetic drug maropitant?

Neurokinin-1 (NK1) receptor antagonist in the emetic center (Correct answer)
Dopamine (D2) receptor antagonist in the chemoreceptor trigger zone (CRTZ)
Serotonin (5-HT3) receptor antagonist on vagal afferent nerves
H1-histamine receptor antagonist in the vestibular nucleus

Correct answer: Neurokinin-1 (NK1) receptor antagonist in the emetic center

Maropitant is a neurokinin-1 (NK1) receptor antagonist. It works by blocking the binding of Substance P, a key neurotransmitter, to NK1 receptors located centrally in the emetic center of the brain. This blockade inhibits the final common pathway for vomiting, making it a very broad-spectrum and effective antiemetic against both central and peripheral causes of vomiting. Metoclopramide is a D2 antagonist, ondansetron is a 5-HT3 antagonist, and diphenhydramine is an H1 antagonist.

Question 91: A 10-year-old Cavalier King Charles Spaniel with known degenerative mitral valve disease presents with an acute onset of coughing and a respiratory rate of 80 breaths/min. Radiographs confirm cardiogenic pulmonary edema. In addition to oxygen therapy, which of the following drugs is most critical for immediate intravenous administration to reduce preload and alleviate the edema?

Pimobendan
Furosemide (Correct answer)
Enalapril
Spironolactone

Correct answer: Furosemide

Furosemide is a potent loop diuretic that acts quickly to promote diuresis, which reduces circulating blood volume and venous pressure (preload). This action directly alleviates the fluid accumulation in the lungs (pulmonary edema) characteristic of acute congestive heart failure. While pimobendan and enalapril are crucial for long-term management, furosemide provides the most immediate and life-saving relief in this acute crisis. Spironolactone is a much weaker, potassium-sparing diuretic used for chronic management.

Question 92: A dog presents with sudden onset of blindness, dilated unresponsive pupils, and elevated IOP of 52 mmHg OD. Which treatment should be initiated immediately?

Topical latanoprost and IV mannitol (Correct answer)
Topical corticosteroids
Enucleation
Oral prednisone

Correct answer: Topical latanoprost and IV mannitol

Acute glaucoma requires emergency reduction of IOP using topical prostaglandin analogues and hyperosmotic agents like mannitol to preserve vision.

Question 93: A 5-year-old dog presents with polyuria, polydipsia, and bilateral cataracts. Fasting blood glucose is 420 mg/dL. Which insulin type is most commonly used for initial management of canine diabetes mellitus?

NPH insulin (Correct answer)
Detemir insulin
Regular insulin
Glargine insulin

Correct answer: NPH insulin

NPH (isophane) insulin is the most commonly recommended starting insulin for dogs with diabetes mellitus, typically given twice daily.

Question 94: Cats are classified as induced ovulators, meaning that:

Ovulation is controlled entirely by day length and seasonal photoperiod
Ovulation is spontaneous and occurs predictably at mid-cycle
Ovulation requires the mechanical stimulus of coitus or exogenous GnRH to trigger the LH surge (Correct answer)
Rising estrogen levels alone are sufficient to trigger ovulation without any external stimulus

Correct answer: Ovulation requires the mechanical stimulus of coitus or exogenous GnRH to trigger the LH surge

In cats, vaginal and cervical stimulation during coitus (or GnRH administration) triggers the hypothalamic-pituitary LH surge required for ovulation; estrus can persist without mating.

Question 95: A goat kid 3 days old presents with watery diarrhea and weakness. Fecal ELISA is positive for rotavirus. What is the most critical supportive treatment?

Systemic antibiotics
Oral electrolyte fluid therapy (Correct answer)
Anthelmintics
Corticosteroids

Correct answer: Oral electrolyte fluid therapy

Viral neonatal diarrhea causes severe dehydration and electrolyte imbalances; oral electrolyte replacement is the cornerstone of treatment since antibiotics are ineffective against viruses.

Question 96: Which of the following zoonotic diseases is most commonly transmitted to humans through direct contact with an infected animal's skin lesions or via fomites contaminated with fungal elements?

Leptospirosis
Brucellosis
West Nile Virus
Dermatophytosis (Ringworm) (Correct answer)

Correct answer: Dermatophytosis (Ringworm)

Dermatophytosis, or ringworm, is a superficial fungal infection of the keratinized tissues (skin, hair, nails). It is classically transmitted by direct contact with the fungal lesions on an infected animal or person, or indirectly through contact with contaminated fomites like bedding or grooming tools. Leptospirosis is typically transmitted via contaminated urine/water, West Nile Virus is vector-borne (mosquitoes), and Brucellosis is transmitted via contact with reproductive tissues or unpasteurized dairy.

Question 97: A farmer presents a 4-week-old calf with a soft, non-painful, easily reducible swelling at the umbilicus approximately 3 cm in diameter. There are no signs of infection or systemic illness. What is the most appropriate initial management recommendation?

Recommend immediate application of a hernia clamp.
Prescribe a course of systemic antibiotics to prevent infection.
Advise surgical repair within the next week.
Suggest monitoring; many small, uncomplicated hernias resolve spontaneously. (Correct answer)

Correct answer: Suggest monitoring; many small, uncomplicated hernias resolve spontaneously.

Small (less than 5 cm or '2-3 fingers' wide), uncomplicated, reducible umbilical hernias in young calves often resolve without intervention as the calf grows and the abdominal wall strengthens. Surgical correction is typically delayed until the calf is older (e.g., weaning) if the hernia persists or enlarges. Hernia clamps are generally not recommended due to risk of complications, and antibiotics are not indicated without evidence of infection.

Question 98: In the context of avian influenza surveillance, the term 'spillover event' refers to:

Transfer of influenza virus between two wild bird species
Transmission of an avian influenza strain to a mammalian (non-avian) host (Correct answer)
Introduction of a human influenza strain into a domestic poultry flock
Reassortment of influenza gene segments between two avian strains

Correct answer: Transmission of an avian influenza strain to a mammalian (non-avian) host

Spillover refers to interspecies transmission events where an avian influenza strain crosses from avian hosts into mammals, including pigs or humans, with pandemic potential.

Question 99: A dairy herd vaccination program for bovine respiratory disease (BRD) should ideally target animals at what time point for maximum efficacy?

2-4 weeks before anticipated stress events or high-risk periods (Correct answer)
At the time of clinical signs in the first affected animal
Immediately at weaning with no prior preparation
Only after confirmed pathogen identification via PCR

Correct answer: 2-4 weeks before anticipated stress events or high-risk periods

Vaccinating 2-4 weeks before stress events allows adequate time for protective immune responses to develop before animals face high-risk periods.

Question 100: A 9-year-old Boxer presents with a 2-month history of progressive seizures. To best evaluate the brain parenchyma for a suspected intracranial mass, which imaging modality provides the highest level of soft tissue detail and is considered the gold standard?

Magnetic Resonance Imaging (MRI) (Correct answer)
Survey skull radiographs
Computed Tomography (CT)
Abdominal ultrasound

Correct answer: Magnetic Resonance Imaging (MRI)

Magnetic Resonance Imaging (MRI) is the superior imaging modality for evaluating soft tissues, including the brain parenchyma, due to its excellent contrast resolution. It is considered the gold standard for diagnosing intracranial masses like tumors, inflammation, or infarcts. Computed Tomography (CT) is better for bone and can detect some large masses but provides significantly less detail of the brain's soft tissue structures compared to MRI. Skull radiographs are not useful for viewing the brain itself.

DVM (Doctor of Veterinary Medicine) Exam

The DVM (Doctor of Veterinary Medicine) Exam exam validates essential knowledge and skills required for certification or licensure in this field.

100

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120 min

Time Limit

70%

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