Cat hissing at her brother

On Feb 7, 7:46 pm, ~ narnia ~ wrote:
My cat hisses at her brother when she comes home from the vet. This is
really odd, because she's the one who smells from the vet, not him! I
even rubbed the two of them with catnip to see if that would help, but
it didn't work.

These two are littermates and usually get along fine, but when he sees
her hostile reaction to him he gets defensive and hisses back, and I
have to separate them. Last time this happened it took me weeks to get
things back to normal.

Has anyone else had to deal with a problem like this?

My cats are not littermates, but yes, I have this same problem. One of
my cats freaks out when he smells the vet--on him or the other cat. I
now separate them after any vet trip. I bring the one who's been to
the vet in a spare room and feed him. While he's eating, I shut the
door. After a while, I will feed the cats treats on either side of the
the door, then open the door and let them see each other's noses and
smell, etc. I take it slowly. I've had to separate anywhere from 2-12
hours. I had an incident last year where I had to basically
reintroduce them, and it tooks months to get things calmed down, so a
few hours is nothing!