10/21/2026
Can dogs have heart attacks?
Much like in humans, a heart attack (or myocardial infarction) in dogs occurs when blood flow to a portion of the myocardium (the heart's muscular wall) is blocked, causing the premature death of a portion of the myocardium.
HEART ATTACKS ARE RARE IN DOGS AND CATS, OF MUCH MORE CONCERN ARE HEART DISEASE & CONGESTIVE HEART FAILURE.
Heart disease is typically congenital (meaning your dog was born with it) but old age, injury, infection and obesity can exacerbate it.
Heart disease is almost as common in dogs as it is in humans, but unlike people, smoking and a fatty diet are not risk factors.
The most common form of heart disease in dogs is valvular disease, which primarily affects small breed dogs over 5 years of age and makes up 70-75% of heart disease in dogs.
HEARTWORM INFECTIONS CAUSE 13% OF HEART DISEASE, EVEN THOUGH IT IS COMPLETELY PREVENTABLE.
Myocardial disease, such as dilated cardiomyopathy, makes up 8% of heart disease and primarily affects large breed dogs of all ages.
In dogs with dilated cardiomyopathy, the heart is unable to contract effectively, which results in the heart being unable to pump the blood normally through the body.
As heart disease progresses to congestive heart failure, which occurs when the heart is unable to meet the body's demands, a dog may develop more obvious symptoms.
TAKE NOTICE OF THESE EARLY SYMPTOMS OF HEART PROBLEMS:
- Coughing more than usual (during or after exercise or a few
hours before bedtime)
- Having a hard time breathing or exercising
- Tiring easily
- Pacing before bedtime and having a hard time settling down
- Increased respiratory rate -- how many breaths per minute
Even though most forms of heart disease cannot be prevented, heart disease caused by heartworms can easily be avoided with year-round preventatives.
Likewise, in dogs who have developed heart failure, quality of life and life expectancy can be improved with early diagnosis and treatment.
IF YOUR DOG IS SHOWING ANY SIGNS OF RESPIRATORY DISTRESS, A TRIP TO YOUR VETERINARIAN IS IN ORDER.