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Why is my newly neutered male cat suddenly acting aggressive?

Updated On September 23rd, 2025

Pet's info: Cat | Mixed Breed | Male | neutered | 4 years and 2 months old | 10 lbs

Why is my newly neutered male cat being so aggresive

1 Answer

Most Helpful Answer

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Answered By Angel Alvarado, LVT

Licensed Veterinary Technician

Published on March 7th, 2018

If it was very recent, within the past 48 hours, he may be painful. See your veterinarian for a recheck and for pain medication if indicated. It will take several weeks for his testosterone level to drop, so until then he may show some aggression.

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