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My neutered male cat is sexually aggressive with female. What to do?

Updated On September 23rd, 2025

Pet's info: Cat | Domestic Shorthair | Female | spayed | 6 years and 11 months old

Hi, my neutered male cat is fine with my younger neutered male but is sexually aggressive with my neutered female. Both older cats are 6 years old and were introduced over 5 months ago. He is so aggressive that she defecates herself if he manages to make contact with her. There are no medical issues. I want to try applying androstenone to my females rump to fool said male into thinking she is a fellow male. What product would be best suited as I can't seem to find one? I have tried Feliway.

2 Answers

Most Helpful Answer

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Answered By Stacey Anstaett, DVM

Veterinarian

Published on February 5th, 2020

I'm sorry you're having this situation!  It increases the stress for everyone when inter-cat relationships are aggressive.   While uncommon in neutered males, sexual aggression is still possible. Here is an interesting article from Tufts university regarding this issue.     I haven't personally run into this in my practice, but I have heard of Boar Mate spray being recommended.  Sometimes anti-anxiety medication such as fluoxetine can also be helpful when given to the aggressive cat.   Talk to your veterinarian about specific recommendations for use. http://www.tuftscatnip.com/issues/22_1/feature/Understanding-Feline-Sexual-Aggression-222-1.html

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    Answered By Claudia Fioravanti

    Veterinarian

    Published on

    Hi, it is unlikely that this type of aggression is linked to sexual hormones given the fact that both cats have been neutered. There are lots of things to evaluate. In general when introducing a new cat , you should do it very gradually and to try to keep it semple, it should be done one sense at a time. Initially you should expose the resident cat to the scent of the new individual you want to introduce. This can be done by offering a blanket where the new cat has been sleeping on or that has been previously rubbed around the cheeks of the new cat. You should monitor the resident cat response to this to start with, then once accepted, progress with keeping them separated but let them view each other for brief periods of time, while something positive occurs or is presented. This process will need to be restarted and be taken very slowly. Hope the outcome is good, from your brief desscription, your resident cat is just reacting normally to the presence of a new cat in his own territory that he is not happy with !

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