I recently found a 15 week old male kitten in a box near my local WalMart and brought him home. I don't plan on keeping him forever, just until I can find him a good permanent home. However, my cat Sadie doesn't like him one bit. She constantly hisses at him and shows the normal signs of aggression to the "newcomer" in our house. I am most worried about if she will warm up to him during his time here. When I brought Sadie home when she a kitten two years ago, my mother had a kitten about the same age already at our house, and they didn't like each other for a while but eventually learned to love each other and snuggled together all the time. I'm hoping it will be the same in this situation, but since Sadie is so much older and bigger than the new kitten Wally (not to mention the opposite sex) I'm not sure what to expect. Can anyone help me about what to do?