How to Tell If Your Dog's Heart Murmur Is Getting Worse
A heart murmur in dogs is not always a sign of a serious condition, but it can progress and lead to more serious heart disease. Knowing how to recognize if your dog’s heart murmur is getting worse can help prevent complications and improve your pet’s quality of life.
What Is a Heart Murmur in Dogs?
A
heart murmur occurs when there’s an abnormal sound during the heartbeat cycle. This sound, often described as a whooshing or swishing, is caused by turbulent blood flow in the heart. Murmurs are graded on a scale from I to VI, with I being the softest and VI the loudest.
Causes of Heart Murmurs in Dogs
Dog heart murmurs can be caused by:
- Congenital heart defects
- Valve insufficiencies or degenerative valve disease
- Heartworm disease
- Cardiomyopathy
- Anemia or other non-cardiac conditions
Signs a Dog's Heart Murmur May Be Getting Worse
As the underlying condition progresses, certain signs may indicate your dog’s heart murmur is worsening:
- Persistent coughing – especially at night or after exercise
- Difficulty breathing or rapid breathing
- Fainting spells or sudden collapse
- Lethargy or decreased energy
- Exercise intolerance
- Abdominal swelling due to fluid accumulation
Monitoring Your Dog’s Condition
Regular veterinary checkups are essential. Your vet may recommend:
- Listening with a stethoscope – to detect changes in murmur intensity
- Chest X-rays – to check for heart enlargement or fluid in the lungs
- Electrocardiogram (ECG) – to assess heart rhythm
- Ultrasound (echocardiogram) – to evaluate heart structure and function
- Blood tests – to rule out anemia or infections
These diagnostic tools allow the vet to determine whether the heart murmur is benign or if it signals heart disease progression.
When to See a Veterinarian Immediately
Seek prompt veterinary attention if your dog shows:
- Lack of appetite or sudden weight loss
- Blue-tinged gums or tongue
- Collapse or seizures
- Labored breathing, restlessness at night
These signs can suggest congestive heart failure or other serious complications.
Treatment Options
Treatment depends on the underlying cause:
- Medications for managing symptoms and improving heart function
- Dietary changes, such as reduced sodium intake
- Lifestyle modifications to reduce stress and activity levels
- Surgical interventions or heartworm treatment if appropriate
Supporting Your Dog at Home
Caring for a dog with a worsening heart murmur involves:
- Administering prescribed medication on time
- Monitoring breathing rate and energy levels
- Maintaining a calm and comfortable environment
- Minimizing exertion and avoiding extreme temperatures
Conclusion
Heart murmurs in dogs can range from harmless to serious. Recognizing the signs that a murmur is getting worse is critical for timely treatment. Work closely with your veterinarian to develop a care plan and monitor your pet’s condition regularly. Early detection and appropriate management can significantly extend your dog’s life and comfort.
