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Cat with heart failure: why is his belly swollen again? Vet visit?

Updated On September 23rd, 2025

Pet's info: Cat | Domestic Shorthair | Male | neutered | 11 years old

Hello, my cat is 11, he was recently diagnosed with heart failure. they drained his abdomen from fluid and told me to give him medication everyday. i always give the medication and he has actually gotten better. however his abdomen has gotten swollen again over the last few days. is this just a symptom of his heart disease or should i visit a vet tomorrow? behaviorwise he is fine, running around the backyard, climbing rooftops, even catching birds, eating fine, cleaning himself etc.

1 Answer

Most Helpful Answer

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Answered By Laura Johnson VMD

Veterinarian

Published on October 23rd, 2018

Hi, thanks for using Petco Pet Education Center, formerly Petcoach! Poor Cuddles! If the fluid is still accumulating in his belly then he should be re-checked. I would also recommend taking him to the cardiologist to 100% determine his abdominal effusion is secondary to heart disease, as that isn't a common presentation for cats. The most common reasons for fluid in the abdomen is FIP and cancer. I would ask the Vet to submit the abdominal fluid to the lab for a fluid analysis and cytology to look fro cancer. I wish you the best!

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