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Question:

5 year old dog w/enlarged heart // lungworm symptoms?

I'm hoping to get some advice or hear from anyone who's been through something similar. My sweet dog, Max, who just turned five, was diagnosed with an enlarged heart last month. The vet said it’s something we need to monitor closely, but recently, I've noticed he's been coughing a lot more than usual and seems a little lethargic. I've read that lungworm can cause symptoms like this, and now I'm freaking out that it could be something more serious. He's on heart medication, but could it be possible that there's something else going on too? Is anyone familiar with these symptoms or has any tips on what I should ask the vet next time we visit? I just feel so helpless seeing him struggle like this, and any advice or shared experiences would be really appreciated. Thanks in advance!

Answer:

Hello there,

It sounds like you're really concerned about your furry friend's health, and that's completely understandable. Let's talk through this together. An enlarged heart in dogs, also known as cardiomegaly, can be caused by a variety of conditions, including heart disease, high blood pressure, or even lung problems. It's distinct from lungworm, although some symptoms might overlap, like coughing and breathing difficulties.

Lungworm, on the other hand, is a parasite that can cause coughing, lethargy, and breathing issues. It’s important to note that an enlarged heart and lungworm have different treatments, so identifying the correct issue is crucial.

At home, make sure your pup is resting comfortably, away from stress or strenuous activity. Ensure they’re hydrated but avoid overexertion until you get a clearer diagnosis.

Please keep an eye out for serious signs like a persistent cough, difficulty breathing, lethargy, or a bluish tint to the gums, as these could indicate a more urgent problem.

Since both conditions can significantly affect your dog's health, consulting with a vet is crucial. I highly recommend booking a video consult with one of our Dial A Vet professionals. They’ll be able to give you tailored advice and help determine the next best steps for your pup’s care!

Answered by

Louise - Senior Veterinary Nurse, Dial A Vet

June 18, 2025

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The "Ask a Vet" forum on Dial A Vet offers general information and helpful tips on pet health, but it's not a substitute for professional veterinary care. The advice here doesn't create a veterinarian-client-patient relationship, and our vets can't diagnose or treat your pet remotely. For emergencies or specific medical concerns, always contact your local veterinarian immediately. Your pet's health is unique, and decisions should only be made after consulting with a qualified professional. By using this forum, you acknowledge these limitations and agree to seek in-person veterinary advice for all your pet's health needs. View our content guidelines.
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