Types Of Heart Diseases In Dogs: Causes & Prevention A Closer Look at Combating Heart Disease

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Unbeknownst to most pet parents, there are ways to battle the onset of heart disease in your dog by having a simple healthy routine. Find out more here on the causes of heart disease in dogs, and how you can may be able to prevent it.

Some forms of heart disease in dogs are preventable, and some are not. Either way, a lifetime of wellness will be invaluable to protecting your dog from the long-term effects of heart disease. Learn about types of heart disease, what causes these issues, and how to prevent them.

Types Of Heart Disease in Dogs and Their Causes

TYPE: Congenital Heart Disease in Dogs

Congenital heart disease means your dog was born with an issue of the heart. Symptoms will almost certainly develop eventually.

Causes of Congenital Heart Disease in Dogs

In the case of congenital heart disease, genetics are primarily to blame. Whether inherited or not, some dogs are simply born with a defect that will lead to heart disease eventually. Just like humans, it’s impossible to know who will fall ill or when. A healthy diet, consistent exercise regimen, and overall happy life are all factors that can delay or even prevent the onset of congenital heart disease.

TYPE: Acquired Heart Diseases in Dogs

Several types of heart disease aren’t congenital. They will all have a similar effect on your dog, and they’ll present in the same way, but they’ll be treated differently by your veterinarian

Some types of heart disease are more common among small breeds (valvular disease, for example), and other types are more common among larger breeds (like a myocardial disease).

Certain infections can lead to heart disease, including heartworms and parvo. These ailments can be very challenging to treat and, if left unattended, can eventually kill your pet.

Causes of Acquired Heart Disease in Dogs

Unlike congenital heart problems, acquired heart diseases can be prevented in many ways. Your pet should receive monthly pest prevention for tickslicemosquitoes, and fleas. Ticks can cause Lyme disease and other ailments, which will all tax the heart. Mosquitoes can transmit heartworms, whose long-term effects can be devastating to your pet and their heart.

Common Misconception: Heart Murmurs

heart murmur is not itself a disease of the heart. It may, however, be an indication that something is awry. If a murmur is observed, ask your vet to do a full diagnostic test to rule out a more serious condition. Some vets will recommend a cardiologist perform a checkup on your pet, including an EKG.

Signs of Heart Disease in Dogs

Persistent Coughing

A primary sign of heart disease in dogs is a cough, especially when paired with shortness of breath or labored breathing. Coughing can indicate other maladies like Lyme disease or kennel cough. If a cough doesn’t resolve over time or with treatments like antibiotics, consider asking your vet to do a diagnostic test.

Changes in Behavior

The appearance of depression can indicate an illness.

Depression in dogs is a common condition. The symptoms can be subtle, so it's important to be able to recognize them.

If you notice that your dog is unusually lethargic and not eating or drinking as much as normal, it may be time to pay attention. If your dog is showing these signs for more than two days, it could be a sign of depression.

Other common symptoms include lack of interest in favorite activities, lack of interest in socializing with family members or other pets, and an unusual amount of sleep.

If your dog suddenly seems to be less happy, get them checked out.

Weight Change

Weight loss without a change in diet can indicate several serious canine conditions, including heart disease. Especially if the weight loss is accompanied by a pot-bellied appearance with a distended belly.

Other Signs

  1. Weakness

  2. Restlessness

  3. Bluish gums, which could indicate that not enough oxygen is in the blood

Prevention of Heart Disease in Dogs

General Wellness

General wellness comes from a quality diet, regular exercise, and a low-stress environment stemming from discipline paired with affection. These elements can help to stave off heart disease.

If your dog does develop a heart condition, their overall well-being will dictate what sort of quality of life they get to enjoy while they’re convalescing. A healthy pet will fare better than an overweight, stressed-out dog.

A lifetime of regular exercise cannot be underestimated. It provides wellness for dogs that nothing else can.

For an overweight dog, a change in diet can help. Hill’s Prescription Diet canned dog food is one such option. You can also opt for the Royal Canin Dog Food. Later, you can ensure a balanced diet for your dog by feeding them the Hill’s Science Diet Dog Food. Another way for them to maintain a healthy weight is by staying active. Dogs can do so even when they’re indoors with the help of interactive dog toys.

Old Age

Heart disease is most common in older dogs, and sometimes, despite a lifetime of love and care, dogs just get sick. Caring for our elderly pets is part of the bargain. You can prepare for this eventuality when you’re bringing your sprightly, bright-eyed puppy into your family by looking into pet insurance or health plan alternatives.

When dogs grow old, many problems can arise. As their bodies become less able to cope with the stresses of daily life, they are more susceptible to illness and disease. They may also be more likely to suffer from cognitive decline, which can make it difficult for them to perform basic tasks like walking around the house or recognizing their owner's face.

Some of these issues are normal and unavoidable as a dog ages; others can be prevented by giving your dog regular checkups at the vet's office. If you notice any sudden changes in your pet's behavior, get him checked immediately.

Diagnosis & Treatment of Heart Disease in Dogs


Your veterinarian may employ different techniques to determine whether your dog is suffering from heart disease. These tests and procedures may include blood work, a chest x-ray, an ECG, an echocardiogram, and a physical exam in which the vet will feel your dog’s body, listen to their heartbeat with a stethoscope, and check their gums.


Treatment is likely to come in the form of medications, like Vetmedin. Some dogs require blood thinners, others require blood pressure medications, and still, others will fare best on simple supplements. Your veterinarian will decide which of a series of different types of medications are best for your dog’s situation. Medication should always be given as per the instructions and according to veterinary recommendations. Consistency is essential.

To deal with heartworms, you need a dewormer for dogs. Heartgard for Dogs, and Heartgard Plus for Dogs, are two heartworm pills for dogs that can help in this case. Such heartworm medicine is super effective in dealing with these worms.

As for preventing heartworms, try using the Seresto Flea Collar for dogs. This dog collar can keep mosquitoes away from dogs, which means that you don’t have to worry about the spread of heartworms through mosquitoes.

In some cases, you may be required to monitor or reduce your dog’s activity level. You’ll also want to be extra aware of their behavior and take note of any changes in appetite, energy, sleep patterns, or behavior.

More on Dog Health Care

Using Tri-Heart vs. Heartguard for Dogs
How a Healthy Dog Weight Can Prevent Disease
7 Ways To Exercise Your Dog in Cold Weather

This information is for informational purposes only and is not meant as a substitute for the professional advice of, or diagnosis or treatment by, your veterinarian with respect to your pet. It has, however, been verified by a licensed veterinarian for accuracy.

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