Canine Heart Disease: The Most Common Conditions

What is canine heart disease?

Canine heart disease refers to any disorder of the heart or blood vessels that affects dogs. The cardiovascular system plays a vital role in a dog's overall health, delivering oxygen and nutrients to every organ and tissue in the body, so any abnormality in this system can have a significant impact on the animal's health and well-being.

Causes of heart disease in dogs

Heart disease in dogs can have many causes, including genetic factors, diet, advancing age, and conditions acquired over the course of the animal's life.

Genetic factors

Some dogs may be genetically predisposed to certain cardiac conditions. By understanding the genetic predisposition of a specific breed, we can watch for early signs of heart disease and take preventive measures.

Advancing age

Just as in humans, aging can affect a dog's heart health. As they grow older, dogs may develop changes in the heart tissue, heart valves, and blood vessels, increasing their risk of cardiac conditions. Owners of senior dogs should be aware of the signs of heart disease and schedule regular check-ups to monitor their pet's cardiac health.

Acquired diseases

Beyond genetic factors and advancing age, certain conditions acquired during a dog's life can raise the risk of developing heart disease: cardiac infections, endocrine disorders, diabetes, and autoimmune diseases.

Preventing these conditions through proper vaccination, parasite control, and a healthy, balanced diet can help reduce the risk of developing heart disease.

Preventive care

Keeping a dog's heart healthy calls for a proactive approach to its care. Here are some preventive measures:

Regular veterinary visits: routine exams are essential for catching any health problem early, including cardiac issues.

Healthy diet: a balanced, nutritious diet is key to maintaining a dog's heart health. Avoiding foods high in fat and sodium helps prevent obesity and other conditions that can affect the heart.

Regular exercise: keeping a dog active with regular exercise helps maintain a healthy heart and blood vessels while also managing weight.

Parasite control: parasites such as fleas, ticks, and worms can transmit diseases that affect the heart. Keeping the dog up to date on recommended preventive medications is essential.

Watch for warning signs: stay alert to signs of cardiac problems, such as a persistent cough, difficulty breathing, excessive fatigue, and exercise intolerance.

The 6 main types of canine heart disease, symptoms, and treatment

Below you will find six of the most common forms of canine heart disease, along with their main symptoms and treatment approaches.

Myxomatous Mitral Valve Disease (MMVD)

This is one of the most common forms of heart disease in older dogs, especially in small breeds. MMVD involves the degeneration of the heart valves, leading to blood leakage and, eventually, heart failure.

Symptoms: chronic cough, difficulty breathing, tiring easily, fainting, abdominal swelling.

Treatment: management may include medications to relieve symptoms, such as diuretics and angiotensin-converting enzyme (ACE) inhibitors, a special diet, and, in advanced cases, surgery to repair or replace the affected heart valve.

Dilated Cardiomyopathy (DCM)

In this condition, the heart muscle becomes weak and dilated, impairing the heart's ability to pump blood effectively to the rest of the body.

Symptoms: weakness, lethargy, cough, rapid and shallow breathing, exercise intolerance.

Treatment: management may include medications to improve cardiac function, such as diuretics and ACE inhibitors, frequent monitoring, and, in severe cases, supportive therapy or even a heart transplant in extreme situations.

Hypertrophic Cardiomyopathy (HCM)

Unlike DCM, in HCM the heart muscle becomes thick and stiff, interfering with the heart's ability to fill properly between contractions.

Symptoms: difficulty breathing, exercise intolerance, weakness, fainting, abnormal heartbeats.

Treatment: management may include medications to control blood pressure and heart rate, a special diet, frequent monitoring, and, in some cases, surgery to remove part of the thickened heart muscle.

Pericarditis

This is an inflammation of the pericardium, the membrane that surrounds the heart. It can be caused by infections, trauma, or autoimmune diseases.

Symptoms: cough, difficulty breathing, lethargy, fever, pain around the chest.

Treatment: management may include anti-inflammatory medications, pain relievers, rest, and, in severe cases, drainage of the fluid around the heart.

Heartworm disease (dirofilariasis)

This is a parasitic disease transmitted by various types of mosquitoes, including Aedes aegypti, that can cause serious damage to a dog's heart and lungs.

Symptoms: persistent cough, difficulty breathing, weakness, exercise intolerance, abdominal swelling.

Treatment: management may include medications to kill the worms, supportive therapy to control symptoms, and, in advanced cases, surgery to remove the worms from the heart and lungs.

Congestive Heart Failure (CHF)

This is a condition in which the heart cannot pump enough blood to meet the body's needs, resulting in a buildup of fluid in the lungs and/or the abdomen.

Symptoms: chronic cough, difficulty breathing, fatigue, abdominal swelling, exercise intolerance.

Treatment: management may include medications to improve cardiac function, a special diet, activity restriction, frequent monitoring, and, in severe cases, supportive therapy or a heart transplant.

How is canine heart disease diagnosed?

Early diagnosis of heart disease in dogs is essential to ensure the best possible prognosis. Veterinarians use a range of diagnostic methods, including clinical exams, radiographs, echocardiograms, and blood tests, to assess cardiac function and detect abnormalities.

The electrocardiogram (ECG) is a crucial tool in diagnosing heart disease in dogs. It is a non-invasive procedure that records the heart's electrical activity, providing valuable information about the rhythm, fluctuations, and cardiac function of the animal for a possible early diagnosis.

For dogs with known heart disease, the ECG is often used to track the progression of the condition and the effectiveness of treatment.

A dog's cardiac health is a fundamental part of its overall well-being. By recognizing the early warning signs and carrying out regular exams, we can fight these canine comorbidities far more effectively. Awareness of canine heart disease and the importance of early diagnosis are essential to ensure our four-legged companions receive the care they deserve.