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Heart Murmurs in Dogs are a common concern among pet owners, especially as dogs age. One of the most frequent causes behind these murmurs is mitral valve disease, a progressive heart condition that affects many small and senior breeds. In this guide, we’ll break down what mitral valve disease is, how it leads to heart murmurs in dogs, common symptoms, diagnosis, and treatment options to help you better protect your pet’s heart health.
What Are Heart Murmurs in Dogs?
Heart murmurs in dogs are abnormal sounds heard during a heartbeat, typically detected by a veterinarian using a stethoscope. These sounds occur due to turbulent blood flow within the heart.
Murmurs are graded on a scale from 1 to 6, depending on their intensity. While some murmurs are harmless, others may indicate underlying heart conditions like mitral valve disease.
Common causes of heart murmurs include:
- Mitral valve disease (most common)
- Congenital heart defects
- Heart infections
- Anemia or high blood pressure
Understanding the root cause is essential for proper treatment and long-term management.
What Is Mitral Valve Disease in Dogs?
Mitral valve disease (MVD) is a degenerative condition where the mitral valve in the heart becomes thickened and leaky over time. This valve is responsible for controlling blood flow between the left atrium and left ventricle.
When the valve doesn’t close properly, blood leaks backward, creating the turbulence that leads to heart murmurs in dogs.
Key facts about MVD:
- Most common in small breeds like Cavalier King Charles Spaniels, Dachshunds, and Chihuahuas
- Typically develops in middle-aged to older dogs
- Progressive condition that worsens over time
Early detection plays a major role in slowing the disease progression.
How Mitral Valve Disease Causes Heart Murmurs
When the mitral valve deteriorates, it cannot seal tightly. This leads to a condition called mitral regurgitation, where blood flows backward instead of forward.
This backward flow causes:
- Turbulent blood movement
- Increased pressure in the heart
- Enlargement of heart chambers over time
The turbulence is what veterinarians hear as heart murmurs in dogs during an exam. As the disease progresses, the murmur typically becomes louder and more noticeable.
Signs and Symptoms to Watch For
In the early stages, dogs with mitral valve disease may show no symptoms at all. However, as the condition advances, signs become more apparent.
Common symptoms include:
- Persistent coughing, especially at night
- Fatigue or decreased activity
- Difficulty breathing or rapid breathing
- Loss of appetite
- Weight loss
- Fainting episodes in severe cases
If your dog shows any of these symptoms along with known heart murmurs in dogs, it’s important to seek veterinary care promptly.
Diagnosing Mitral Valve Disease
Diagnosis begins with a physical exam where your veterinarian detects a murmur. To confirm mitral valve disease and assess its severity, additional tests are often required.
Diagnostic tools include:
- Chest X-rays to evaluate heart size and lung condition
- Echocardiogram (ultrasound of the heart) for detailed structure and function
- Electrocardiogram (ECG) to assess heart rhythm
- Blood pressure measurement
These tests help determine how advanced the disease is and guide treatment decisions.
Treatment Options for Heart Murmurs in Dogs
While mitral valve disease cannot be cured, it can often be managed effectively with proper care and medication. Treatment depends on the stage of the disease.
Common treatment approaches:
- Medications such as diuretics, ACE inhibitors, and pimobendan to improve heart function
- Dietary adjustments, including low-sodium diets
- Weight management to reduce strain on the heart
- Regular monitoring through vet checkups
Dogs diagnosed early can live comfortable lives for years with the right treatment plan.
Lifestyle Changes to Support Heart Health
Managing heart murmurs in dogs caused by mitral valve disease goes beyond medication. Lifestyle adjustments can significantly improve quality of life.
Helpful lifestyle tips:
- Maintain a consistent, moderate exercise routine
- Avoid excessive stress or strenuous activity
- Monitor breathing rate at home
- Provide a heart-healthy diet
- Keep up with regular veterinary visits
Small changes can make a big difference in slowing disease progression.
When Should You See a Veterinarian?
If your dog has been diagnosed with a heart murmur or shows symptoms of heart disease, regular veterinary visits are essential.
Contact your vet if you notice:
- Increased coughing or breathing difficulty
- Sudden lethargy or weakness
- Reduced appetite
- Any change in normal behavior
Early intervention is key to managing heart murmurs in dogs effectively and preventing complications like heart failure.
Mitral valve disease is the leading cause of heart murmurs in dogs, especially in aging and small-breed pets. While the condition is progressive, early detection through preventive care and proper management can greatly improve your dog’s quality of life.
If you suspect your dog may have a heart murmur or is showing symptoms of heart disease, don’t wait. Schedule a checkup with the experienced team at East Greenbush Animal Hospital in East Greenbush, NY, to ensure your pet receives the care they deserve.
FAQs
Q1: What is the most common cause of heart murmurs in dogs?
Ans: Mitral valve disease is the most common cause, especially in small and older dogs.
Q2: Can heart murmurs in dogs go away on their own?
Ans: Some mild murmurs may not require treatment, but those caused by mitral valve disease usually persist and need monitoring.
Q3: How long can a dog live with mitral valve disease?
Ans: With early detection and proper treatment, many dogs can live several years with a good quality of life.
Q4: Are heart murmurs in dogs always serious?
Ans: Not always, but they should always be evaluated by a veterinarian to determine the underlying cause.
Q5: What breeds are most at risk for mitral valve disease?
Ans: Small breeds like Cavalier King Charles Spaniels, Dachshunds, and Chihuahuas are most commonly affected.
I have a GSD who isn't always her best self at the vet. She goes every 6 to 8 weeks for allergy shots so it is hard to create a positive association. My GSD has been going here since she was a puppy, and the staff are wonderful. At our last visit I learned that they actually put a note on my girl's file that she "does best receiving her treatments in the chair with mom holding her head." That made me happy to know that they wrote a note to ensure the visit doesn't create more stress for my dog.
