When a client reports a sudden and significant change in their dog's behavior, such as uncharacteristic aggression or house soiling, what is the most crucial first step for a professional dog trainer to recommend?
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A
Immediately implement a program of NILIF (Nothing In Life Is Free).
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B
Increase the dog's exercise regimen significantly.
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C
Refer the client to a veterinarian for a full medical evaluation.
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D
Isolate the dog from all triggers for 72 hours.