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My neutered cat attacks people. What causes this sudden aggression?

Updated On September 23rd, 2025

Pet's info: Cat | Domestic Mediumhair | Male | neutered | 4 years and 1 month old

I have a healthy 3 year old male Tabby by the name Carlos. I had him desexed at about 5 months old & since then I think he's had a certain hormone imbalance. He attacks us & people who come into our home. We've tried sprays, catnip & even oils, plus he's got constant supervision & stimulation & nothing has worked for his attitude.

1 Answer

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Answered By David Darvishian

Veterinarian

Published on December 7th, 2017

Hi and thanks for using Petco Pet Education Center, formerly Petcoach! Sorry to hear about Carlos. Sounds like you have tried a lot of things with no results. I think it's time to take Carlos to your veterinarian. They can collect a history, perform an examination and advise you on any diagnostics or treatment based on their findings. It's possible a medical problem is driving this aggression. Blood/urine/fecal tests and maybe some x-rays could help rule out a medical reason. If no medical problem is identified, a behavioral problem can be addressed. With cats, this will involve some form of medication and maybe some behavior modification. There are some medications we use for aggression in cats. Prozac, Buspar, Xanax, are among some of them. Again, I would advise taking Carlos to your vet to try to get a handle on this behavior. Good luck

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