Congestive Heart Failure in Dogs and Cats
Congestive heart failure (CHF) occurs when the heart cannot pump enough blood to meet the body's needs. Learn the signs, treatment, and how to support your pet with CHF.
Congestive heart failure (CHF) is a serious condition where the heart fails to pump blood effectively, causing fluid to accumulate in the lungs (pulmonary edema) or abdomen (ascites). CHF is not a disease itself but the end stage of various heart conditions. While it cannot be cured, proper treatment can significantly extend and improve quality of life for months to years.
Key Points
- CHF is the end stage of heart disease — not a disease itself
- Fluid in the lungs (pulmonary edema) causes difficulty breathing — the most dangerous symptom
- Resting breathing rate at home is the best way to monitor CHF — normal is under 30 breaths/minute
- Treatment involves diuretics (furosemide), ACE inhibitors, and sometimes other heart medications
- Dietary sodium restriction helps reduce fluid retention
- Many pets with CHF live comfortably for months to years with proper treatment and monitoring
How CHF Develops
When the heart weakens (from valve disease, cardiomyopathy, or other causes), it cannot pump blood efficiently. Blood backs up into the lungs, causing fluid to leak into the air spaces (pulmonary edema). This makes breathing difficult. In right-sided heart failure, fluid accumulates in the abdomen (ascites) or limbs. The body tries to compensate by increasing heart rate and retaining fluid, which eventually makes the problem worse.
Recognizing CHF Symptoms
Early signs: exercise intolerance, coughing (especially at night), rapid breathing. As CHF progresses: difficulty breathing even at rest, open-mouth breathing in cats, blue-tinged gums (cyanosis), distended abdomen, fainting. Cats often show nonspecific signs — hiding, decreased appetite, lethargy. Dogs more commonly show coughing and exercise intolerance.
Treatment Protocol
Diuretics (furosemide/Lasix): remove excess fluid from the lungs — the most critical medication. Pimobendan: strengthens heart muscle contractions — especially effective in dogs with mitral valve disease. ACE inhibitors (enalapril, benazepril): reduce strain on the heart. Spironolactone: additional diuretic that also protects the heart. Oxygen therapy: for acute CHF crises requiring emergency stabilization.
Home Monitoring
The most important thing you can do at home: count your pet's resting breathing rate daily. Count breaths for 30 seconds while your pet sleeps, multiply by 2. Normal: under 30 breaths/minute. If consistently above 30, contact your vet — fluid may be building up. Keep a log of breathing rates to share with your vet. Also monitor: appetite, energy level, coughing frequency, and exercise tolerance.
When to See a Vet Immediately
- Your pet is breathing rapidly or with difficulty, even at rest
- Your pet's resting breathing rate consistently exceeds 30 breaths per minute
- Your pet's gums or tongue are blue or purple
- Your pet has fainted or collapsed
- Your pet's abdomen appears swollen or distended
- Your pet with heart disease shows decreased appetite or increased lethargy
How RVC Can Help
Royal Veterinary Center provides comprehensive cardiac care including echocardiography, ECG, blood pressure monitoring, and cardiac biomarker testing (NT-proBNP). We manage CHF with evidence-based medication protocols and teach home breathing rate monitoring. Emergency oxygen therapy is available 24/7. Call +853 6677 6611.
This article is for educational purposes only and does not replace professional veterinary advice. If your pet is showing any symptoms, please contact Royal Veterinary Center immediately at +853 6677 6611.