I have had my cat since she was abandoned at four weeks old. Now, eight months later, I have brought home another kitten. Calia, this older cat, growls and hisses at the newcomer. I've heart conflicting stories about introducing them. Some say leave them be, some say keep them separated and just let them get used to the other's scent in various ways. Any advice you can give me is greatly appreciated. Also, the new kitten has not eaten anything since I brought her home yesterday, not even water. Any suggestions?