Heart murmurs in dogs are an important health concern that can impact your pet’s quality of life if left unchecked. Recognizing and addressing heart murmurs early can help prevent complications like congestive heart failure and support long-term cardiac health. This guide covers what heart murmurs are, how to monitor them, and practical steps to help your dog thrive.
Understanding Heart Murmurs in Dogs
A heart murmur is an extra sound in your dog’s heartbeat, often described as a whooshing noise that your veterinarian can hear through a stethoscope. Murmurs can range from very mild (barely detectable) to loud enough that a veterinarian can feel them by placing a hand on your dog’s chest. They are graded on a scale from 1 to 5, with 1 being the softest and 5 being very loud.
Most heart murmurs are discovered during routine wellness exams, emphasizing the importance of keeping annual veterinary appointments. According to Dr. Erin Corrigan, medical director at VCA Fairmount Animal Hospital in Syracuse, New York, “Early diagnosis helps us intervene while there’s still something we can do, whether it’s a puppy with a congenital problem or an older dog with a new murmur.”
A normal dog’s respiratory rate is 15 to 30 breaths per minute. If your dog is relaxed or sleeping and breathes over 35 times per minute, this could indicate a heart problem and warrants an immediate veterinary visit. Observing your dog’s breathing is simple: count chest rises for 15 seconds and multiply by four to determine breaths per minute.
Types of Heart Murmurs
Heart murmurs in dogs fall into two main categories:
Congenital Murmurs
Congenital murmurs are present from birth, typically caused by structural heart defects. Most murmurs in puppies are soft, benign, and termed innocent or physiologic murmurs, often resolving by six months of age.
Acquired Murmurs
Acquired murmurs develop later in life, usually due to heart valve abnormalities or cardiac muscle disease. The most common cause is myxomatous mitral valve degeneration, a condition where the mitral valve between the left atrium and ventricle degenerates. This degeneration allows blood to flow backward, increasing strain on the heart and potentially leading to congestive heart failure if unmanaged. Certain breeds, like Cavalier King Charles Spaniels, have a genetic predisposition, while larger breeds may experience murmurs due to cardiomyopathy.
Monitoring and Managing Heart Health
If your veterinarian detects a murmur, an echocardiogram is typically recommended to confirm the diagnosis and establish a baseline for heart function. Repeating echocardiograms annually helps track progression. This non-invasive test usually does not require anesthesia.
A pro-BNP blood test can also monitor cardiac stress by detecting elevated levels linked to heart muscle strain. Combined with regular check-ups, these tools help guide early intervention.
Supporting Your Dog’s Heart
Even before medications are necessary, you can support your dog’s heart health by:
- Maintaining a healthy weight: Obesity strains the heart and limits exercise, which is essential for cardiovascular health.
- Using prescription diets: Options like Purina Pro Plan Veterinary Diet CardioCare, Hill’s Prescription Diet Heart Care h/d, and Royal Canin Veterinary Diet Early Cardiac offer sodium restriction and nutrients that support cardiac function.
- Regular exercise: Moderate activity strengthens the heart and helps maintain optimal weight.
By implementing these measures, you can significantly slow the progression of cardiac disease and enhance your dog’s quality of life.
Heart Murmurs in Puppies
Most murmurs detected in puppies are benign and often resolve by six months of age. If a murmur persists, an echocardiogram is advised to evaluate cardiac status and prognosis. This is particularly important for dogs intended for breeding, as it helps determine ethical breeding decisions, and for surgical procedures, to assess anesthesia risks.
The prognosis depends on the type of congenital defect. While many puppies live normal lifespans, surgery may be an option for others.
Conclusion
Monitoring and managing heart murmurs in dogs requires vigilance, regular veterinary care, and lifestyle support. Early detection, proper diet, weight management, and routine check-ups can make a critical difference in preventing congestive heart failure.
For ongoing guidance on canine heart health and more pet care tips, explore our other articles on dog health and wellness and ensure your furry companion enjoys a long, healthy life.
References
- Cornell University College of Veterinary Medicine, DogWatch Newsletter, Belvoir Media Group.
- VCA Animal Hospitals, Heart Disease in Dogs.
- Purina Veterinary Diets, Pro Plan CardioCare.
- Hill’s Prescription Diet Heart Care h/d.
- Royal Canin Veterinary Diet Early Cardiac.