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Neutered male cat 6 weeks ago: Why is he still aggressive and humping?

Updated On September 23rd, 2025

Pet's info: Cat | Russian Blue | Male | neutered | 10 months and 20 days old | 9.25 lbs

Got my male cat nutered 6 weeks ago and he's still very aggressive towards my 4 year old female cat. Also still has the urge to hump.

4 Answers

Most Helpful Answer

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Answered By David Darvishian

Veterinarian

Published on July 31st, 2017

Hi and thanks for using Petco Pet Education Center, formerly Petcoach! Sounds like Prince is still experiencing some signs associated with the male hormone testosterone. The testosterone levels drop after the neuter and should be decreasing now. Hopefully this behavior will ease up as the remaining testosterone gets out of his system. If things don't resolve or his signs worsen, I would advise that your veterinarian take a look at both of them to assess any problems. I hope this gets better soon.

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Other Answers

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    Answered By Cara, DVM, cVMA

    Veterinarian

    Published on

    It may take some time for the effects of testosterone to leave Princes system, and some of the behavior may just be kitten play as he is still pretty young. I would have your female cat spayed as well if she isn't already just to reduce the stimulation for him.

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    Answered By Megan, DVM, CVA

    Veterinarian

    Published on

    Unfortunately sometimes the humping doesn't go away. If Prince is really dominant the aggression and humping could be a sign of dominance. Also, Russian blues can sometimes have an aggressive personality. You may want to consider adding some feliway diffusers and sprays in your house to help calm him. Also, try to increase the environmental enrichment. Also be sure there are plenty of places for each of them to have their own personal space and be sure you have at least 2-3 litter boxes so no one is guarding and getting territorial over one litter box. Finally, if this doesn't help, he may need to be placed on a low dose of anti-anxiety medicine to help him adjust. Unfortunately, not all cats get along but most will get to the point where they tolerate one another. I hope this helps!

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    Answered By David Darvishian

    Veterinarian

    Published on December 9th, 2017

    Hi and thanks for using Petco Pet Education Center, formerly Petcoach! Sorry to hear about your cats. Not sure how old Batman is but it could take up to 2 months for the testosterone level to decrease after neutering if he is an adult cat. These 2 cats may never get along and you may have to resort to using some medication(s) to address this problem. You could try some pheromone sprays (Feliway) or calming sprays and see if that doesn't help. There are also some diffusers that you plug in that can potentially calm down some pets. If this behavior continues and it's significant I would advise taking them to your veterinarian for a consultation. Your vet may advise some medical tests to rule out a medical problem but this sounds like primarily a behavioral problem. One or both cats may need to be put on some medication to address any fear/anxiety/stress that they are experiencing. Good luck with your kitties.

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