Cat behavior after neutering
by tony.beeby
(Maryport, cumbria,UK)
my female cat has turned nasty with our other cats since being neutered. she hisses at me aswell sometimes - she was not like this before the operation . we have another female who was done at the same time plus 2 female kittens from herwho have not been neutered yet 1 is 18 mnths and the other is 6 months old
Answer by KAte
Hi this sounds like something called aggression trauma. This happens when a cat has been frightened by something and it often happens after a trip to the vets.
She needs some time to calm down and to also rebuild her confidence with the other cats again. the usual way to do this is to go through the introduction technique with her and the other cats. It does take a little time and effort but does help in the long run.
Here is the page with the technique
https://www.our-happy-cat.com/introducing-cats.html
best wishes Kate