Canine DCM: Dilated Cardiomyopathy NAVLE Study Guide

Canine DCM shows up on the NAVLE reliably. It tests breed recognition, pathophysiology, echo interpretation, arrhythmia identification, and specific drug choices. The board loves this condition because one question can layer three or four concepts at once.

Breed Predispositions

Breed is everything with DCM. The NAVLE will give you a signalment and expect you to connect it to the right pathophysiology immediately. Doberman Pinschers are the number-one breed for DCM in terms of prevalence and clinical significance. They develop an occult (preclinical) phase that can last years before overt heart failure, and they carry the highest risk of sudden cardiac death from ventricular arrhythmias. Holter monitoring is the standard surveillance tool – more than 100 VPCs per 24 hours in a Doberman is clinically significant and warrants close follow-up.

Giant breeds round out the classic DCM list: Irish Wolfhound, Great Dane, Scottish Deerhound. These dogs tend to develop atrial fibrillation as a hallmark arrhythmia. Boxers get a related but distinct condition – arrhythmogenic right ventricular cardiomyopathy (ARVC), sometimes called Boxer cardiomyopathy. On the NAVLE, ARVC is tested separately: Boxer, right ventricle, VPCs/ventricular tachycardia, syncope. Do not conflate it with the primary DCM entity.