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My cat is lethargic, not eating, and losing weight. Should I see a vet?

Updated On September 23rd, 2025

Pet's info: Cat | Mixed Breed | Male | neutered | 11 years old | 20 lbs

My big cat is lethargic and seems to be losing some body mass. He started feeling down about 2 weeks ago. He does not have a fever and was eating (not as much as usual) and drinking water until yesterday. Now he seems to not be interested in food but is still drinking water fine. Last week his eyes started to water a bit but that seems to be clearing up. He just seems exhausted, My question is when or if should I take him to a vet. Should I wait it out and see if he rebounds?

1 Answer

Most Helpful Answer

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Answered By Jennifer Ladd, DVM

Veterinarian

Published on May 3rd, 2017

Cats tend to deteriorate quickly, so I would recommend a veterinary visit. Starting with blood work which will include a cell count, an evaluation of organ function and a thyroid evaluation should help your veterinarian to find what the source is. Cats can develop Hepatic Lipidosis or a fatty liver after a few days of not eating, and this can be difficult to reverse. I would bring him in today if possible.

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