I went through this when I brought home Bonzo. He was just about an 8wk. old kittten and Mocha Bean was 1yr. Mocha was VERY offended that I would bring ths little thing into HER house! It took us a few weeks, almost a month before She came to accept him. I was SO upset. My Husband (then he was just a neighbor) lived in the next Apt. and I kept running over to his house crying. Mocha was SO MAD at me for bringing him home. I finally just gave them both some space and they worked it out in about a month. I let Mocha find her own hiding places away from Bonzo and let her decide when it was safe. Right or wrong she only stayed REALLY mad for a day or two, after that she was just really stand-offish.......Now they are the best of friends....Well, sometimes