10 Questions Cat Owners Ask About Heart Disease — Answered by Dogwood’s Cardiology Team

Heart disease in cats is sneaky. Cats rarely cough when their heart is failing — they become quieter, breathe a little faster, and hide more. By the time many cats are diagnosed, disease is already advanced. Here’s what every cat owner should know.

What is the most common heart disease in cats?

Hypertrophic Cardiomyopathy (HCM) — the muscular walls of the heart thicken, making it less efficient at filling with blood. It affects cats of all ages and breeds, but Maine Coons, Ragdolls, British Shorthairs, and Persians are genetically predisposed.

My cat seems totally normal. Could they still have heart disease?

Absolutely. HCM in its early stages causes no visible symptoms. Many cats are diagnosed when a murmur or abnormal gallop rhythm is detected at a routine exam. This is exactly why regular wellness visits matter — and why we recommend cardiac screening for high-risk breeds starting at age 2–3.

What are the symptoms of heart disease in cats?

Early: slightly faster resting breathing, reduced activity, less interest in play, hiding more than usual. Advanced: labored breathing, open-mouth breathing (always an emergency in cats), sudden collapse. Some cats also develop blood clots (aortic thromboembolism) causing sudden hind limb paralysis — a terrifying emergency requiring immediate care.

What is an aortic thromboembolism (ATE)?

A blood clot travels from the heart to the aorta, blocking blood flow to the hind legs. Sudden paralysis of one or both hind limbs, extreme pain, and cold legs with pale nail beds are the classic signs. This is a life-threatening emergency — call (404) 609-1234 and come directly to Dogwood.

How is feline heart disease diagnosed?

Diagnosis includes cardiac auscultation (listening for murmurs and gallops), echocardiogram (the gold standard — shows wall thickness and blood flow in real time), chest X-rays to check for fluid, blood pressure measurement, and cardiac biomarker testing (proBNP).

Can HCM be cured?

HCM cannot currently be cured, but it can be managed effectively. Medications to slow heart rate, reduce blood pressure, and prevent clot formation can significantly slow progression. Some cats with HCM live comfortably for years. Early diagnosis before heart failure develops is key — which is why screening matters.

Should I have my cat screened even if they seem healthy?

Yes, especially if your cat is a high-risk breed, male (HCM is more common and severe in male cats), or middle-aged or older. An echocardiogram is the only reliable way to detect early HCM. We recommend screening for at-risk breeds starting at age 2–3 years.

Is my cat in pain from heart disease?

HCM itself is generally not painful in early stages. However, congestive heart failure causes respiratory distress that is very uncomfortable, and aortic thromboembolism is acutely painful. Our palliative and cardiology teams work together to ensure comfort at every stage.

What happens at a cardiology appointment at Dogwood?

Your cat will be seen in a calm, low-stress environment using Fear Free handling. The cardiologist performs an echocardiogram, takes chest X-rays if indicated, and reviews your cat’s complete history. Appointments typically take 1–2 hours. You will leave with a clear diagnosis, a management plan, and direct follow-up access.

How do I get a referral to Dogwood for my cat’s heart?

Your primary vet can submit a referral through our online portal, or contact us directly. Dr. Johnathan Goodwin leads our cardiology service and sees both dogs and cats.

Early detection of HCM can add years to your cat’s life. Ask your primary vet for a referral, or contact us directly at (404) 609-1234 to schedule a cardiac screening at our Marietta, GA facility.