It can be anxiety-inducing, watching the dog you love live with heart disease. Every cough, every slower walk, every restless night can leave you wondering if their condition is worsening.
The good news is that many dogs with heart disease continue to enjoy a happy, active life for months or even years with the right care. Learning what changes to look out for can help you recognise when it’s time to speak to your vet.
1. A persistent cough
An occasional cough isn’t always a cause for concern, but a cough that becomes more frequent or severe can be.
Dogs with heart disease may cough because an enlarged heart puts pressure on the airways or because fluid begins to build up in the lungs.
If your dog’s cough:
- Happens more often than usual
- Is worse at night or after exercise
- Sounds wetter or more persistent
it’s worth contacting your vet for advice.
2. Faster breathing at rest
One of the simplest ways to monitor your dog’s heart health is by checking their resting respiratory rate.
When your dog is sleeping or completely relaxed, count how many breaths they take in one minute.
For many healthy dogs, a resting respiratory rate is usually below 30 breaths per minute. If you notice a consistent increase over several days, especially above your dog’s normal baseline, contact your vet for advice.
Many owners find it helpful to keep a note of their dog’s resting respiratory rate each week.
3. Becoming tired more easily
If your dog starts slowing down on walks, struggles to keep up, or seems reluctant to exercise, it may be a sign that their heart isn’t pumping as efficiently as before.
This doesn’t always mean their disease has progressed, but it’s something your vet should know about. This was actually the sign I noticed with Star before he went into heart failure.
4. Reduced appetite
Dogs can hide illness surprisingly well.
A reduced appetite, weight loss, or showing less interest in treats can sometimes indicate that your dog isn’t feeling their best.
If your dog refuses food for more than a day or their appetite changes significantly, speak to your vet.
5. Collapse or fainting
Although less common, collapsing or fainting (known as syncope) can occur in dogs with certain heart conditions.
If your dog collapses, even if they seem to recover quickly, contact your vet immediately.
When Should You Call Your Vet?
Contact your vet promptly if you notice:
- A worsening cough
- Increased resting breathing rate
- Difficulty breathing
- Collapse or fainting
- Marked lethargy
- Refusing food
- Swollen abdomen
Early intervention can often make a significant difference.
Small changes matter
As dog parents, it’s easy to question whether we’re overthinking every little change. The reality is that you know your dog better than anyone else. If something doesn’t feel right, trust your instincts and seek professional advice.
Keeping a simple diary of your dog’s breathing rate, appetite, exercise tolerance, and any coughing episodes can help your vet build a clearer picture of how your dog’s condition is changing.
Supporting your dog every day
Alongside regular vet check-ups, prescribed medication, appropriate exercise, and a balanced diet, many owners choose to support their dog’s heart health with carefully selected nutritional supplements.
At StarTails, we created our Heart Support Supplement after our own journey caring for a dog with heart disease. We understand how overwhelming it can feel, and our mission is to help owners feel informed, supported and a little less alone.
Disclaimer: This article is for educational purposes only and is not a substitute for professional veterinary advice. If you’re concerned about your dog’s health, always consult your vet promptly.