Strange aggression post-neutering

r0n1n

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I have two cats, a tiny  adult spayed female and a giant male kitten.  Both have lived together happily for six months even as the male outgrew the female.  We live in an apartment with no other nearby cats. They never go outside.

He was always dominant over her, even as a small kitten - he's very outgoing and boisterous.  As he got older he'd occasionally get randy and "try it on" with her so we decided to get him neutered this week.  We dropped him off at the vet in the morning then came home and we noted that she was in quite a good mood and was very exploratory and friendly and we joked that she was enjoying life without him.  We brought him home from the vet at lunch time.

He was a little dazed and traumatized by his experience so he was skulking around the corners.  And then She, half his size, started stalking him.  She'd jump out at him from behind corners and hiss and swipe at him.  He was still kind of timid and would run off which we'd never seen before.  She even chased him away from his food bowl.

It's been a few days and she's still treating him like a stranger.  He's more or less back to normal with us, running and chasing things but every time he goes near her by accident, at meals or even just for a friendly nuzzle she swats him.  She looks permanently angry.

It's really odd because he was only out of the house for a few hours and he's pretty much behaving the same as he used to, minus the occasional sexual aggression. We thought they'd get along better post-neutering, not worse.

Any idea why this could be?  Could his smell have changed already?  Is she trying to establish a new world order?
 

MoochNNoodles

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Cats generally know each other by scent.  Just the scents on him from going to the vet are enough to make her recognize him as strange and act like this.  Add in the surgery, anesthesia, etc; this is actually very common. 
It can take a few months for his hormones and things to completely calm down; so it's not his scent in that way that has changed.  It's just the experience.

I would try scent swapping (rub them both with the same wash cloth and towel) and a dab of vanilla behind each of their necks.  I do the vanilla trick after taking my girls to the vet for just check ups because it gets Noodles' having hissy fits for up to 3 days afterward!  Even when they go together.  If things get really tense between them; you can separate them (put him in a bedroom with his essentials) and begin the process of reintroducing them after a few days.  There is a good article on introducing cats to cats in the sticky at the top of the behavior forum that may have some other ideas. 

I hope things are back to normal for you soon!!
 

lamiatron

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i've NEVER had that issue with the my cats hating each other after going to the vet...and then i just realized...I always schedule their appointments at the same time....and even if i have an appt for just one kitty, I always bring the other one along (they calm each other down & they can't be separated for LONG periods of time)

I guess i'll have to continue taking them together...don't know what i'd do if i took one to the vet and the other started to attack her/him because he/she smelled different =(
 
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r0n1n

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Cats generally know each other by scent.  Just the scents on him from going to the vet are enough to make her recognize him as strange and act like this.  Add in the surgery, anesthesia, etc; this is actually very common. 
It can take a few months for his hormones and things to completely calm down; so it's not his scent in that way that has changed.  It's just the experience.

I would try scent swapping (rub them both with the same wash cloth and towel) and a dab of vanilla behind each of their necks.  I do the vanilla trick after taking my girls to the vet for just check ups because it gets Noodles' having hissy fits for up to 3 days afterward!  Even when they go together.  If things get really tense between them; you can separate them (put him in a bedroom with his essentials) and begin the process of reintroducing them after a few days.  There is a good article on introducing cats to cats in the sticky at the top of the behavior forum that may have some other ideas. 

I hope things are back to normal for you soon!!
Thanks MoochNNoodles, I might try the vanilla trick and brush them with the same brush.
 
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