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My dog has an enlarged heart. What should I expect for his future?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed Small (up to 22lb) | Male | unneutered | 6 years and 7 months old

Hi. Found out today my beautiful 7yr old shih tzu King Charles mix has an enlarged heart. Vet has put him on vetmerin tablets. So worried. What is the Outlook for dogs with enlarged hearts?

1 Answer

Most Helpful Answer

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Answered By Ricardo Fernandez, DVM

Veterinarian, Veterinary Oncology Resident

Published on July 25th, 2018

Thanks for using Petco Pet Education Center, formerly Petcoach! This depends on what is causing the heart to be enlarged. There are many heart diseases like chronic degenerative valve disease that can be managed throughout their lifetime and dogs can live a long life versus something like dilated cardiomyopathy which has a poor longterm prognosis. I would recommend you discuss with your veterinarian what seems to be the specific issue. A referral to a veterinary cardiologist can always be considered to get more specific information about the diagnosis, treatment and prognosis. This usually takes performing an echocardiogram and an electrocardiogram. Good luck and have a great day!

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