Heart disease in dogs doesn’t necessarily come with big fanfare. It may creep up on you quietly just the tired walk, a bit of coughing, or missing an appetite. Things we tend to brush off. But catching them early can make a real difference in how much time you have left with your best buddy.Let’s dissect what to check for, why heart issues in dogs occur, and what you can do about it.
What Causes Heart Disease in Dogs?
The majority of heart disease in dogs occurs over a period of time. They’re not typically born with it—but certain breeds have a higher chance of developing it later on.
The most common causes are:
Age-related changes in the heart valves (especially in small dogs like Cavaliers)Enlarged heart (also known as dilated cardiomyopathy, which is common in larger breeds of dogs like Dobermans)
- Heartworms
- High blood pressure
- Obesity
- Genetic factors
Early Signs You Should Never Ignore
Heart disease is subtle in that it can start with really mild symptoms. These are the signs you’ll want to watch out for:
- Tiredness Your dog doesn’t want to walk as far as before. They tire easily or seem lazy.
- Coughing, especially at night or after resting for a while.
- Deep or labored breathing, even when resting.
- Swollen belly This can be fluid retention, not always weight gain.
- Loss of appetite or rapid weight loss.
- Paralysis of the hind legs, particularly in medium and larger dogs.
One or two of these signs may not be heart disease but all together, it’s a good idea to touch base with a vet.
Severe Symptoms
When It’s an Emergency
If your dog is showing any of the following, it could be a sign that the heart is actually in trouble:
- Gasping for breath
- Blue or blue-tinged gums
- Collapsing or fainting
- Profound weakness
- Refusal to eat or drink
- Foam coughing up (white or pink)
Don’t wait. These are terminal symptoms, and your dog needs immediate care.
Understanding the Stages of Heart Disease
Cardiologists often speak of heart disease in four stages:
- Stage A – No symptoms yet, but the dog is at risk (naturally because it’s a breed).
- Stage B – Body changes to the heart, but no visible symptoms yet.
- Stage C – Symptoms like coughing, fatigue, or lethargy start to appear.
- Stage D – Heart failure is severe, and treatment becomes more urgent.
Most dogs are only diagnosed during Stage C. That is why early checks are important.
Can It Be Treated?
The good news is yes, heart disease can be treated, especially if it’s caught early.
Treatment may include:
- Daily medication to strengthen the heart’s pumping action or help reduce fluid build-up
- Low-sodium diet
- Dietary supplements (like omega-3, taurine, or CoQ10)
- Frequent monitoring and heart scans
In serious cases, oxygen therapy or intensive care may be needed. Your vet will recommend based on stage and symptoms.
Prevention Tips That Actually Help
While you can’t eliminate all heart disease, there is a great deal you can do to reduce the risks:
- Keep your dog at a healthy weight
- Eat a balanced, heart-healthy diet
- Use a monthly heartworm preventative
- Go for regular check-ups with your vet if your dog is older
- Avoid salty treats and processed snacks
- Prevention is worth paying a little price.
Life Expectancy and Living With Heart Disease
Dog with heart disease isn’t automatically less time—assuming it’s caught early and well-managed.
What are the first signs of heart disease in dogs?
The earliest signs of heart disease in dogs are usually subtle. You may notice your dog gets tired quickly during walks, coughs more often (especially at night), or seems less interested in play. Rapid breathing or appetite changes are also common.
How can I tell if my dog has heart problems?
Look out for signs like persistent coughing, weakness in the back legs, breathing heavily while resting, or swelling in the belly. These can all point toward heart disease. A vet can confirm it with tests like X-rays or an ultrasound.
Are certain dog breeds more prone to heart disease?
Yes, some breeds are more at risk. Small breeds like Cavalier King Charles Spaniels often develop valve-related heart disease, while large breeds like Dobermans are prone to conditions like dilated cardiomyopathy.
Can a dog live a normal life with heart disease?
Many dogs can live happy, comfortable lives with heart disease especially if it’s diagnosed early. With proper medication, diet, and monitoring, your dog may enjoy several more years of good quality life.
What are the signs of heart failure in dogs?
Late stage heart disease can lead to heart failure. Signs include constant coughing, blue gums, gasping for air, fainting, and swelling in the abdomen. These symptoms require emergency veterinary attention.
What are the signs of heart failure in dogs?