I have a 15 year old cat and an 8 month old kitten. Two weeks ago I adopted a 3 month old kitten. The two kittens became fast friends but we're making no progress with the older cat. He seems ready to accept her but she continues to hiss and growl. She even hisses and growls when I put his blanket in her room. She was a bottle-fed kitten, so not disciplined by her mother. I have to decide between returning her to the rescue while she's still small and cute and will be adopted by someone else or keeping her and hoping things will improve. I realize two weeks isn't a terribly long time, but I'm not sure her personality is a good match.