I took my 9 month old girl in to get fixed,brought her home that night and my older cat hisses at her,won't go around her and I'm affraid to let them be alone together,FIRST time cat care taker/lover of my cats, I don't know what to do ,HELP
Your spayed cat came home with smells from the vet. Put your spayed girl in a room by herself, so she can relax and recoup. You can rub the the one who wasnt spayed with a towel and rub the towel onto the girl who was spayed to get her smell to familiar again.
Or you can put a dab of pure vanilla at the base of their tails and right under their chins, so they will both smell the same.