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My older cat's fur is rusty and he's irritable. Vet visit needed?

Updated on September 23rd, 2025

Pet's info: Cat | American Shorthair | Male | neutered | 12 years and 3 months old | 21 lbs

I noticed lately that parts of my cats fur has turned a bit rusty. I looked it up and its probably nothing to worry about but I saw something that said it could be due to liver/kidney/thyroid problems. Since hes a bit of an older cat (12 years old) I'm a bit worried since hes also gotten a bit irritable lately (although that may be due to us getting a puppy recently). It could be nothing but I don't know whether to take him to a vet just in case.

1 Answer

Most Helpful Answer

David Elbeze, DVM, MRCVS

Answered By David Elbeze, DVM, MRCVS

Veterinarian

Published on November 13th, 2016

I think you are correct with your suspicion, kidney or thyroid disease are a possibility and a simple blood test (including T4 for thyroid) will be able to detect those diseases and hopefully it will come back negative so you can have peace of mind.
Vote Icon1Pet Parents found this answer helpful

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