Non-recognition agression

I took my boy twinkie to get neutered a couple days ago . His sister, Pirate, was hissing and acting horrible with him for a day and a half, but she stopped and everything is going back to normal (thank god it didnt last long). Now idk how much research or knowledge anyone would have on this subject.. I understand it was the scent of the vet, but does she just see him as a new cat from now on ? Arent cats supposed to have good memory ? Does she know its her brother or does she see him as a new cat?? He seems a bit sad she was acting that way and still approaches her with caution . I have yet to see them play like before as their usual selves (which is fine as he is healing). But do you think cats ever realize hey thats my brother? also does taking them to the vet together help at all? I still have to take her thanks!!!

This isn't a big deal.  He still smells like himself, but with additional vet smells added in.  They'll be back to normal in no time!

talkingpeanut said:

 
This isn't a big deal.  He still smells like himself, but with additional vet smells added in.  They'll be back to normal in no time!

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This is normally true.  Once he grooms himself enough he should smell completely like himself and only himself again and things should return to normal.  I have one cat who growls and hisses whenever any of the others go to the Vet.  None of the others react that way towards the others, only that one.  Some cats are just more sensitive (and perhaps more terrirorial). 

One thing that might help in situations like that is to brush a few strokes with their brush on HER along her sides, then immediately brush him with the same brush to pass her scent over to him, then back over to her again.  Do this several times through the day until she has settled down.

I'm guessing things are back to normal by now? 

When SHE goes in,that's another story, because she will be the one who smells different, HE will smell the same.  Hard to tell whether or not he will have any reaction to her or not.  She will be there longer, probably, just because females are more involved.   For future visits, like annual check-ups, I find it's just easier to take them all together, and it DOES solve this type of issue.  . 

Thank you for the advice! Yes everything is back to normal. I was upset when she was acting that way, he seemed a bit hurt and confused. This is my first pair of cats that ive owned since i was around 12 years old, these two are my first pair of cats i own as an adult. Im very scared to lose them, And honestly never knew about this type of agression. Im thinking my girl, Pirate, is more territorial. She hisses through the window to this outdoor cat while it doesnt seem to bother him, Twinkie. I will take them together when she goes in and see how it goes.

Oh, there is no need to stress him out and bring him to the vet when she goes to get spayed.  She'll have to stay for the procedure anyway, so you'll be bringing him home without her and he'll have time to readjust first.  I would do the scent transfer described above.  Also remember that this discomfort should only last for a day at most - everyone will recover!

That is true, im pretty sure he will be scared going to the vet now. Okay thanks !

Yes, I wasn't talking about taking him in unnecessarily.  I was speaking about FUTURE visits like annual exams, whenthey would both need to go in anyway...taking then at the same time rather than schedule two separate visits. 

I understand, he does need his vaccines though but im sure that will be quick.