Updated November 1, 2026. Fact-checked against veterinary sources; review by a licensed veterinarian is in progress. See our editorial policy.
There is no single way to prevent every kind of heart disease in dogs. Some conditions, such as certain valve diseases or inherited cardiomyopathies, develop despite excellent care. Still, regular veterinary exams, appropriate nutrition and maintaining a healthy body condition can help dogs stay well and make it easier to detect problems before advanced heart failure develops.
Know what type of heart disease matters
Small older dogs commonly develop changes to heart valves, while some large and giant breeds are predisposed to dilated cardiomyopathy (DCM). A murmur is a finding, not a complete diagnosis; its meaning depends on the dog and further examination. Veterinary teams may recommend chest imaging, electrocardiography or echocardiography in selected patients.
Keep diet decisions grounded in evidence
Feed a complete, balanced diet suited to the dog’s life stage and medical needs. Ask your veterinarian before using restrictive or unusual formulations, especially if your dog has a breed risk for DCM. Some diet-associated cardiomyopathy questions remain under investigation; it is not accurate to say every grain-free food inevitably causes heart disease. Supplements should not replace a diagnosis or prescribed cardiac medication.
Activity and body condition
Regular appropriate exercise and maintaining a healthy weight support general health, but they cannot erase a hereditary condition. If your dog already has heart disease, the veterinarian should help decide what activities are safe. Do not push a dog who is coughing during exertion, fainting or breathing faster than normal at rest.
Ask about screening if your breed is at risk
Breeds predisposed to DCM may benefit from recommended screening before symptoms appear. Discuss your dog’s family history, unusual fatigue, fainting, reduced exercise tolerance or cough. Emergency care is needed for labored breathing, collapse or severe weakness. For home observations and support, see heart disease emergency signs in dogs.
Source
Cornell University College of Veterinary Medicine: Dilated Cardiomyopathy.
This article is for general education and is not a substitute for care from your own veterinarian. Learn about The Pet Vet and our editorial policy.