Dog Heart Murmur – Guide for Pet Parents

Heart murmurs in dogs are not necessarily a sign of a disease but can indicate underlying heart issues that need attention. From exploring the different types and causes of heart murmurs to discussing the latest in diagnosis and treatment options, we’ll explore every aspect of this condition.

We will also offer practical advice on how to care for your pet, ensuring they lead a comfortable and happy life.

What is a Heart Murmur?

dog heart health

A heart murmur in dogs is an extra or abnormal sound heard during a heartbeat. It’s usually identified through a stethoscope and sounds like a whooshing or swishing noise alongside regular heartbeats.

Murmurs are caused by turbulent blood flow in the heart or nearby vessels, which can be due to a variety of reasons, including heart valve issues or abnormalities in the heart’s structure.

These murmurs are graded on a scale from I to VI, with I being barely audible and VI being extremely loud, helping veterinarians assess the severity of the condition.

What Are the Causes?

  1. Congenital defects, present from birth, are a common cause of heart murmurs in dogs. These defects can include malformed valves or holes in the heart walls.
  2. Acquired heart diseases, such as degenerative valve disease or dilated cardiomyopathy, can develop later in life and lead to murmurs.
  3. External factors such as anemia, high blood pressure, or hyperthyroidism can also cause heart murmurs, though these are less common.

Symptoms and Diagnosis

Dog Heart Murmur

The presence of a heart murmur itself often doesn’t cause any noticeable symptoms in dogs, especially in the early stages. However, as the underlying condition progresses, symptoms like coughing, fatigue, or difficulty breathing may emerge.

Diagnosing a heart murmur typically starts with a veterinarian listening to the dog’s heart using a stethoscope. This is often followed by further diagnostic tests such as X-rays, an electrocardiogram, or an echocardiogram.

These diagnostic tests help in identifying the underlying cause of the murmur, which is crucial for determining the appropriate treatment and management plan.

Managing Heart Murmurs in Dogs

Dog Heart Murmur activity

The management of heart murmurs in dogs largely depends on the underlying cause and the severity of the condition. This section covers the various approaches, including lifestyle changes, medical management, and the role of pet parents in caring for a dog with a heart murmur.

Lifestyle Modifications

Simple lifestyle changes can be beneficial for dogs with mild heart murmurs. These include:

  • maintaining a healthy weight,
  • engaging in moderate exercise,
  • feeding a balanced diet tailored to heart health.

Avoiding excessive exertion and stress is important, as these can exacerbate heart problems in dogs with murmurs. Regular check-ups with a veterinarian are crucial for monitoring the heart’s condition and making timely adjustments to the dog’s lifestyle.

Medical Management

Medical management of heart murmurs may include medications like diuretics to reduce fluid build-up, ACE inhibitors to lower blood pressure, or beta-blockers to manage heart rate. Frequent veterinary check-ups are essential for adjusting medication dosages and monitoring the progression of the heart condition.

In advanced cases, more intensive treatments like hospitalization or oxygen therapy may be required to manage the dog’s symptoms and improve quality of life.

The Role of the Pet Parent

Pet Parent

Pet parents play a vital role in managing their dog’s heart murmur. This includes administering medications as prescribed, keeping up with regular veterinary appointments, and monitoring their dog for any changes in behavior or health.

Understanding the condition and the necessary lifestyle adjustments can help pet owners provide the best care for their dogs. Emotional support and creating a comfortable, stress-free environment are also important aspects of caring for a dog with a heart murmur.

How to Enhance the Quality of Your Pet’s Life?

1. Create a Comfortable Home Environment

Making your home comfortable and stress-free is vital for dogs with heart murmurs. This can include providing a quiet resting area, comfortable bedding, and minimizing loud noises or disruptions. Temperature regulation is important, as extreme temperatures can stress a dog’s heart.

Keeping your home cool in summer and warm in winter can help maintain your dog’s comfort. Easy access to food, water, and a resting place is important, especially for dogs that tire easily due to their heart condition.

2. Meet Your Dog’s Needs

Dog's Needs

Recognizing and responding to your dog’s individual needs is crucial. This may mean adjusting walk lengths, providing more frequent rest breaks, or modifying playtime to be less physically demanding.

Regular grooming and skin care are important, as some dogs with heart conditions may have less energy for self-grooming. Being vigilant about any changes in behavior, appetite, or energy levels can help in the early identification of potential complications or necessary adjustments in care.

3. Engage in Suitable Activities

Choosing the right activities for your dog is key. Opt for gentle, low-impact exercises like short walks or light play that won’t overexert your pet. Mental stimulation is just as important as physical activity.

Puzzle toys, scent games, and gentle training exercises can keep your dog mentally engaged without putting strain on their heart. Regular, but not excessive, interaction with other dogs can provide social stimulation, as long as it’s in a controlled and stress-free environment.

Advanced Treatments

Dog care

Advancements in veterinary medicine have opened up new possibilities in treating and managing heart murmurs in dogs.

Surgical interventions, such as repairing or replacing faulty valves, can be considered for certain types of heart murmurs, especially those caused by congenital defects.

Cardiac catheterization and other minimally invasive procedures are increasingly being used to correct structural heart abnormalities in dogs. Research into new medications and treatment protocols continues to evolve, offering hope for more effective management of heart murmurs in the future.


Can a heart murmur in dogs go away on its own?

In some cases, especially in puppies, a heart murmur may resolve as the dog matures. However, in adult dogs, heart murmurs are often indicative of an underlying heart condition that may not resolve without treatment.

Regular veterinary check-ups are essential to monitor the condition and determine the appropriate course of action.

Are certain dog breeds more prone to heart murmurs?

Yes, some dog breeds are more predisposed to heart murmurs due to genetic factors. Breeds like Cavalier King Charles Spaniels, Doberman Pinschers, and Boxers are known to have a higher incidence of heart conditions that can lead to murmurs.

It’s important for owners of these breeds to be particularly vigilant about heart health.

Is exercise safe for dogs with heart murmurs?

Moderate exercise is often beneficial for dogs with heart murmurs, but it should be tailored to the dog’s individual tolerance and condition. High-intensity activities or strenuous exercise may be harmful. It’s best to consult with your veterinarian to create an appropriate exercise plan.

How does diet affect a dog with a heart murmur?

Diet plays a significant role in managing heart murmurs in dogs. A diet low in sodium can help manage symptoms associated with heart disease, such as fluid retention. Additionally, diets formulated for heart health, rich in omega-3 fatty acids and lower in fat, can be beneficial.

Always consult your veterinarian before making any dietary changes.

Can stress worsen a dog’s heart murmur?

Yes, stress can have a negative impact on a dog’s heart health, potentially exacerbating a heart murmur. It’s important to create a calm, stable environment and minimize situations that cause anxiety or stress in your dog.

Regular routines, gentle handling, and avoiding overly stimulating environments can help.

What are the long-term implications of a heart murmur in dogs?

The long-term implications of a heart murmur in dogs depend on the underlying cause. Some dogs live normal lives with minimal impact, while others may develop more serious heart conditions requiring ongoing management.

Regular veterinary care is crucial for monitoring the condition and optimizing the dog’s quality of life.


Caring for a dog with a heart murmur can be challenging. It requires a blend of knowledge, compassion, and proactive management. Remember, the love and care you provide are the most significant factors in enhancing your dog’s well-being.

With your support, dogs with heart murmurs can lead full and happy lives, filled with the same affection and joy they bring to us every day.