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Why is my senior cat losing weight but eating a lot with bad breath?

Updated On September 23rd, 2025

Pet's info: Cat | Persian | Male | neutered

My cat is 16 years old, he has been loosing weight lately even though he eats a lot! And also his saliva is smelling really bad, I checked his teeth and they seem fine, what could it be?

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1 Answer

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Answered By Ricardo Fernandez, DVM

Veterinarian, Veterinary Oncology Resident

Published on December 6th, 2018

Thanks for using Petco Pet Education Center, formerly Petcoach! Losing weight despite having a good appetite is a classic sign seen with hyperthyroidism. This is just one possibility among other conditions. I recommend you check in with a veterinarian for further assessment and treatment. They would be able to check for this and proceed with therapy accordingly. Best of luck!

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