I also am having difficulty integrating my newest cat into my cat family. My husband and I lost our only cat, Genevieve, to intestinal cancer in April 2000. We thought we'd wait til the end of summer to adopt another cat, since Genevieve's medicines had had to be given to her twice a day for the past year, so we couldn't ever leave home. Of course, we got so durn lonesome that this plan went by the boards before a month was up. We adopted three Siamese Crosses from local rescue organizations within the next two months and they blended without a hiss or a swat! We thought we were pretty amazing at this, but boy, we have found out differently since then. I took in a seven-year- old Siamese boycat, Mau, this past August as a foster, but fell in love with him and adopted him too. He is a very large cat who doesn't have a dominant personality, but who doesn't allow himself to be bullied either. The problem is my girlcat, Dinah Lee, who at first had a bit of a crush on him, but now wants to kill him and drink his blood. We keep him segregated during the day, except that we allow the two boys in to visit when we are there to supervise. Dinah lies in wait outside his room and if she can sneak in, she'll attack him on sight. Mau will retreat until he finds a good defensive position, then will growl and hiss menacingly until she backs off (he's twice her size). I have put Dinah into a cat carrier and brought her into Mau's room a couple of times. She sits quietly, but Mau hisses at her from across the room whenever she looks at him. At first, Mau seemed very rattled by Dinah's attacks, but it seems now like he finds them exhilarating! Is this a good sign? Is there hope? Please, any advice would be appreciated!