health
DCM (dilated cardiomyopathy)
What DCM is
In dilated cardiomyopathy the muscular wall of the left ventricle thins and dilates. The heart loses contractile strength, blood backs up into the lungs and abdomen, and signs of congestive heart failure appear: coughing, exercise intolerance, fast breathing at rest, fainting, or sudden collapse.
Which animals are at risk
DCM has a genetic basis in several large and giant breeds, Doberman Pinschers, Great Danes, Irish Wolfhounds, Boxers, and a few others. Cocker Spaniels can develop a taurine-responsive form. Cats develop DCM much less often than dogs; most feline DCM today is also taurine-related and has become rare since commercial cat foods began supplementing taurine in the 1980s.
Since 2018 the FDA has investigated reports of DCM in dogs from breeds not normally predisposed, in association with grain-free diets high in pulses. A definitive causal mechanism has not been established as of the FDA's latest update.
What owners can watch for
- Persistent cough, especially at night
- Reduced stamina, reluctance to exercise
- Fast or labored breathing while resting
- Fainting or collapse episodes
- Distended abdomen
Why it matters
DCM is progressive and often silent until the heart is already failing. Early detection through screening echocardiogram in at-risk breeds, and a vet conversation about diet for any breed, materially changes outcomes. This is not a guide-it-yourself condition.
Frequently asked questions
- Can DCM be reversed?
- Taurine-deficient cases can improve, sometimes substantially, once diet is corrected. Genetic DCM cannot be cured; medication slows progression and manages signs.
- Should I screen my dog for DCM?
- For at-risk breeds, yes, periodic cardiology screening (auscultation, echocardiogram, sometimes 24-hour Holter monitoring) is standard. Your vet or a veterinary cardiologist will set the schedule.
- Is DCM contagious?
- No. It is not infectious.