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Dogs can suffer from a variety of heart problems, just like humans. In fact, it is estimated that 10% of all dogs in the USA suffer from some heart disease. So let’s take a brief look at some of the most common heart problems in dogs and what you can do to prevent or treat them.

Two Types of Heart Problems in Dogs

Your pet's heart problem can either be congenital, which is a term for health issues dogs are born with, or acquired, which are those that are caused by some external factors.

Congenital heart disease is caused by genetics but it doesn’t have to be hereditary. Dogs with congenital heart problems will usually develop symptoms at some point in their life. However, this can be delayed or even prevented with a healthy diet and regular exercise. Reducing stress can also help because stress contributes to early onset of congenital heart disease.

Acquired heart disease can include different types of heart problems but the most common ones are valvular and myocardial disease. Heart disease can also be caused by some infections, like heartworms and parvo. While the effects of these issues are pretty similar, the treatment can be very different.

Recent studies show that dogs born in summer are at higher risk of heart disease.

What Breeds Are at Risk?

All breeds can suffer from the below mentioned heart issues, but some breeds are more prone to these issues than others.

Large and giant breeds are more prone to conditions like enlarged heart or heart failure. Some of these breeds known to often have these issues are Boxers, Dobermans, German Shepherds, Rottweilers, Retrievers and Great Danes.

Small and toy breeds, on the other hand, are more susceptible to heart problems related to the heart valves. Some of these breeds include Spaniels (especially Cavalier King Charles Spaniels), Miniature and Toy Poodles, Dachshunds and Miniature Schnauzers.

4 Heart Problems in Dogs
(and what you should know)

Heartworm Disease in Dogs

1. Heartworm Disease

Heartworm disease is responsible for around 13% of heart diseases in dogs even though it can be completely prevented with medications. Prevention is particularly important in areas with greater mosquito population since this parasitic infection is contracted through mosquito bites. However, heartworm disease has been diagnosed in all 50 US states.

Symptoms:

Heartworm disease is very serious and will be fatal if left untreated. While the disease can sometimes be asymptomatic, especially in the first stage, common symptoms include persistent cough, fatigue, decreased appetite and weight loss. In later stages dogs may cough blood.

Treatment:

Treating canine heartworm disease starts with the killing of the adult worms in the heart and arteries, along with larvae from the bloodstream. Your vet will administer heartworm medications, usually melarsomine via injections for adult worms and ivermectin for larvae. He may also prescribe antibiotics or steroids if needed, for more severe infections. Pain medications are often given to make the injections less painful.

Myocardial Disease in Dogs

2. Myocardial Disease

Myocardial disease is the type of heart disease that attacks the animal's heart muscle and is thought to be responsible for 8% of all heart problems in dogs. There are different variations of this disease, but the most common one is called dilated cardiomyopathy (DCM). This disease is characterized by the enlarged heart that doesn’t work properly.

Causes:

This condition is more prevalent in senior dogs, although the exact causes are largely unknown. Some evidence suggests genetic predisposition, while other evidence points to the lack of carnitine or taurine in a dog’s diet as a potential contributor to DCM in some breeds.

Symptoms:

The most notable symptoms of dilated cardiomyopathy include rapid breathing, coughing, shortness of breath, lethargy, anorexia and abdominal distension. Some dogs might also suffer from transient loss of consciousness. There can sometimes be fluid present in the lungs, which can cause your dog’s breathing to sound crackling or muffled. Some less noticeable symptoms of DCM can be spotted with a detailed physical examination of the heart.

Treatment:

Treatment for dilated cardiomyopathy is focused on improving the health of the heart and its function. Unfortunately, dogs with DCM usually have a poor prognosis and the goal is to make the rest of dog’s life as comfortable as possible.

Your vet may prescribe drugs to increase heart contraction and to improve your dog’s breathing. If there is accumulation of fluid in the lungs, your vet will prescribe diuretics as well. Drugs that enhance dilation of the blood vessels, called vasodilators, can make the heart pump blood more efficiently. Hospitalization is usually not required, except in severe cases.

Your vet will monitor your dog’s progress on regular checkups but you will also have to be alert and watch for any changes in your dog’s behavior and signs of further heart issues.

Valvular Disease in Dogs

3. Valvular Disease

Valvular disease is the most common form of heart disease in dogs since it is responsible for around 70% of all heart problems. This disease is also known as chronic valve disease (CVD) or endocardiosis.

Causes:

Chronic valve disease is usually more prominent in dogs that are older than 5 years. It is also more likely for small breeds to develop this condition.

Basically, CVD is a degenerative process related to aging. There is no determined cause, although there is probably an inherited genetic component, at least in some breeds. While many dogs with dental disease also suffer from chronic valve disease, dental disease is not considered to be the cause of CVD.

Symptoms:

Some of the most common clinical signs of CVD include rapid and shallow breathing at rest, labored breathing, restless sleep, weakness, coughing, decreased appetite, weight loss and lethargy. Some dogs may experience fainting or collapse, as well as distended belly.

Treatment:

Unfortunately, currently there is no way to prevent or even slow down the progression of chronic valve disease in dogs. There are medications your vet may prescribe if your dog has symptomatic CVD, which is a more advanced stage of the condition. These medications can help him relieve the symptoms but they will not treat the disease itself.

Some lifestyle changes may be necessary if your dog suffers from CVD, especially diet changes. That includes feeding a balanced diet and avoiding excessive sodium. If your dog is overweight, he may have to go on a weight reduction program.

Congestive Heart Failure in Dogs

4. Congestive Heart Failure

Congestive heart failure (CHF) is not a disease itself but rather a stage in the development of other canine heart problems, especially chronic valve disease. It's a term that describes the heart's inability to pump enough blood to other organs and the rest of the body.

Causes:

It is estimated that most of the CHF cases are caused by valvular insufficiency. However, there are many other causes that lead to CHF, like cardiomyopathy, narrowing of major blood vessels and rhythm irregularities.

Symptoms:

Early symptoms of congestive heart failure in dogs are the same as other heart problems – breathing difficulty, coughing, tiring easily, increased respiratory rate, etc. However, with the progression of the disease other symptoms may appear, including fluid buildup in the abdomen, change in tongue or gum color to a shade of blue, weight loss and fainting.

Treatment:

Your dog’s treatment for congestive heart disease will depend on the specific heart problem that is causing it. Some of the possible treatment options include:

  • Low-sodium diet to decrease fluid build-up in abdomen
  • Drugs to slow down fluid build-up in the lungs
  • Drugs that help the heart work better
  • Surgery to repair a torn valve
  • Installing a pacemaker for irregular heartbeat

In conclusion, a dog's heart problems are always serious and recognizing the symptoms on time can help your pet's prognosis and quality of life. Pay attention to various breathing problems such as shortness of breath and labored breathing, coughing, lethargy, poor appetite and weight loss. Take your pooch to the vet to get the proper diagnosis and start the treatment immediately.

READ NEXT: Homemade Dog Food for Heart Disease Recipe

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Top 4 Heart Problems in Dogs - Causes, Symptoms and Treatments

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Kelli Pechal, VT
Kelli is a practicing Licensed Veterinary Technician and a lifelong animal lover who regularly works with pets. On top of her professional dog experience in the veterinary field, Kelli has also worked in a dog boarding facility since 2012. Kelli is also taking care of two rescue dogs of her own, a Border Collie mix and a Westie mix.

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