The earliest signs of heart disease in dogs are a soft cough (especially at night or after lying down), tiring faster on walks, and a resting breathing rate above 30 breaths per minute while asleep. If you notice any of these, schedule a vet visit — early detection can significantly improve outcomes.
What are the first signs of heart problems in a dog?
Heart disease often starts quietly. Watch for: a soft, persistent cough — especially at night or after resting; tiring faster on walks; faster breathing while asleep; restlessness at night; and in later stages, a swollen belly or fainting. Any fainting or collapse is an emergency — go to a vet immediately.
How do I check my dog’s resting breathing rate?
While your dog is fully asleep, count one full rise-and-fall of the chest as one breath. Count for 30 seconds and double it. Under 30 breaths per minute is generally normal. Consistently above 30 — or a noticeable upward trend — is worth mentioning to your vet. Our homepage has a free tap-along counter that does the timing for you.
Which breeds are more prone to heart disease?
- Mitral valve disease: Cavalier King Charles Spaniels, Dachshunds, Chihuahuas, and many small breeds as they age.
- Dilated cardiomyopathy (DCM): Dobermans, Great Danes, Boxers, and other large breeds.
What happens at the vet?
Your vet will listen for a heart murmur, may recommend chest X-rays and blood work, and might refer you to a specialist for an echocardiogram (ultrasound of the heart). The key is staging — determining where things are so the right plan can start at the right time.
How can I support a dog with a heart condition?
Follow any prescribed medication schedule closely, keep their weight healthy, stick to consistent moderate exercise, and monitor their sleeping breathing rate regularly. Talk to your vet about diet — and don’t hesitate to ask for a referral to a specialist if you want a second opinion.
This article is for general information and is not a substitute for veterinary advice.