I have two cats, Louis (Male) and violet (Female). they’re 2 years old and are litter mates, Louis was at the vet for 2 weeks because he had PU surgery, since he has been home, violet won’t stop hissing at louis since he came back from the vet yesterday and today shes still being aggressive to him. ANY ADVICE ON HOW TO MAKE MY KITTIES FRIENDS AGAIN PLEASE!!!