I have three cats that all live indoors. They are 4 (Skitzy) and 3 years old (Boogie), also a 9 month old (Buffy). When I first brough Buffy home she was only a month old and needed a lot of attention. I did not introduce her to my other two cats until she was three months old. I did everything you were supposed to start the process off slowly so the cats don't feel threatened. Well when Buffy was around 6 months old, Boogie started to hiss and make a lot of vocal noise around her, but it is mostly when I am around both cats at the same time. (He is very attached to me and I think he is jellous when I show Buffy attention) Now he has started to hit Buffy, and also Skitzy. Buffy will fight him back, but Skitzy will just run away and hid so he picks on Skitzy more because she will not fight back. I do not know what to do, and need help.