Gus Exhibits Aggressive Behavior Toward Sister

In the past I have had only one cat at a time but I got two this time to keep them from getting lonely. They got along famously until I started Housesitting. Even after I stopped the male continued to attack the female. Not often, but enough to ruin their original friendship. Once I was gone 3 days to a reunion and came home to a floor full of fur. Never a serious injury but the wailing of the female drives me crazy. She always heads for the food dish after being attacked. I have tried the pheremone plug ins, etc. Everything but meds from the vet. Nothing works. This article makes me want to try again, although it will be difficult keeping them separate.

I have brother and sister cats too. They have always played with each other since birth. They had surgery together etc. They were both sleeping with my husband and I. When after walking most of the night with leg cramps, he goes back to bed and falls asleep. He kicks me in his sleep and I let out a scream making the cats run. The female ran first and the male ran after her. They have been fighting ever since. I can't aford a behavioral specialist fee. I don't want to give either cat away. He seems to be depressed but when she comes into the room. He wants to run after her and she hesses, wetting on herself. HELP!