A 3-year-old Labrador Retriever is presented with exercise intolerance and a grade IV/VI holosystolic murmur loudest at the left apex. Echocardiography confirms mitral valve regurgitation with a dilated left ventricle. What is the current recommendation regarding ACE inhibitor therapy at this stage?
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A
Start enalapril immediately to slow progression
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B
Delay ACE inhibitors until congestive heart failure signs appear
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C
Begin pimobendan as the sole therapy
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D
Initiate digoxin for rate control