Heart Disease in Dogs: Signs, Diagnosis, and Vet Treatment

What are the signs of heart disease in dogs?

Heart disease in dogs causes recognisable signs including persistent coughing, reduced exercise tolerance, laboured breathing, and abdominal swelling. MaxPetz in Delhi offers veterinary diagnostics to detect canine cardiac disease early, giving dogs the best chance of a managed, comfortable life. If your dog shows any of these signs, prompt veterinary assessment is essential.

What are the early signs of heart disease in dogs?

Early signs of heart disease in dogs can be subtle and are often mistaken for normal ageing. Recognising them early allows for timely diagnosis and management.

• Persistent cough — especially at night or after rest, caused by fluid accumulation around the lungs
• Reduced exercise tolerance — tiring quickly on walks or play that was previously manageable
• Rapid or laboured breathing — increased respiratory rate even at rest
• Lethargy and weakness — general low energy, reluctance to move
• Fainting or collapse — brief loss of consciousness, particularly after exertion
• Abdominal distension — a swollen belly caused by fluid build-up (ascites)
• Weight loss and muscle wasting — despite normal or increased appetite in some cases
• Blue or grey gums — a sign of poor oxygenation requiring immediate veterinary attention

What causes heart disease in dogs?

Canine cardiac disease has several underlying causes. Understanding the cause helps guide the correct treatment approach.

Which dog breeds are most prone to heart disease?

Certain breeds carry a significantly higher genetic risk for canine cardiac disease. Owners of these breeds should schedule regular cardiac screenings even when no symptoms are present.

• Cavalier King Charles Spaniel — highest risk for mitral valve disease; screening recommended from age 1
• Doberman Pinscher — high risk for dilated cardiomyopathy (DCM)
• Boxer — prone to arrhythmogenic right ventricular cardiomyopathy (ARVC)
• Great Dane — susceptible to DCM due to large body size
• Cocker Spaniel — elevated risk for mitral valve disease
• Dachshund — commonly affected by mitral valve degeneration in later life
• Irish Wolfhound — prone to DCM and atrial fibrillation

Age is also a significant risk factor. Small-breed dogs over 10 years and large-breed dogs over 5 years have a higher incidence of cardiac conditions. Obesity and a sedentary lifestyle may further increase risk.

How is heart disease diagnosed in dogs?

Accurate diagnosis of canine heart disease requires a combination of clinical examination and diagnostic testing. A dog heart murmur detected during a routine check-up is often the first indicator that further investigation is needed.

1. Physical examination — the vet listens for heart murmurs, abnormal rhythms, and lung sounds using a stethoscope
2. Chest X-ray (radiograph) — assesses heart size, shape, and the presence of fluid in or around the lungs
3. Echocardiogram (cardiac ultrasound) — the gold standard for evaluating heart structure, valve function, and chamber dimensions
4. Electrocardiogram (ECG) — records the electrical activity of the heart to detect arrhythmias
5. Blood pressure measurement — hypertension can both cause and worsen cardiac disease
6. Blood and urine tests — assess organ function and identify biomarkers such as NT-proBNP that indicate cardiac stress

At MaxPetz Delhi, the veterinary diagnostics team uses cutting-edge technology to provide thorough cardiac workups, helping to stage the disease accurately and guide the most appropriate treatment plan. Learn more about our veterinary diagnostics services or explore our echocardiogram procedure page for dogs.

Can heart disease in dogs be treated?

Most forms of canine heart disease cannot be cured, but they can be managed effectively with the right treatment plan. The goal is to slow disease progression, relieve symptoms, and maintain quality of life. Treatment depends on the type and stage of heart disease.

• Medications — diuretics reduce fluid build-up; ACE inhibitors reduce the heart's workload; pimobendan improves heart muscle contraction and is commonly used in congestive heart failure in dogs
• Dietary management — low-sodium diets help reduce fluid retention; your vet may recommend a cardiac-specific diet
• Exercise restriction — moderate, controlled activity is advised; strenuous exercise should be avoided in advanced stages
• Regular monitoring — periodic chest X-rays, echocardiograms, and blood tests to track disease progression and adjust medications
• Surgical intervention — in select congenital conditions (e.g. PDA), surgical or catheter-based correction may be possible

When should I take my dog to the vet for heart problems?

Do not wait for symptoms to become severe. Seek veterinary attention at MaxPetz Delhi if your dog shows any of the following:

• A cough that persists for more than 3 days, particularly at night or after lying down
• Breathing rate at rest consistently above 30 breaths per minute
• Any episode of fainting, collapse, or sudden weakness
• Visible abdominal swelling that develops over days
• Gums that appear pale, blue, or grey at any time
• Unexplained weight loss over 2–3 weeks in a dog over 7 years of age
• A breed known to be at high cardiac risk — schedule a baseline cardiac screening even without symptoms

Early-stage heart disease, when caught before congestive heart failure develops, responds better to medication and allows for longer, more comfortable management. Speak to our veterinary team at MaxPetz Delhi to arrange a cardiac assessment.