Its funny you should mention Rosie's experience. Buddie was 2 years older than her, and although they existed together, they never snuggled or did the "pig pile" although they did sleep on the same couch or bed together, just in their own corners. However, the night Bud became ill, he found a corner and just laid there, and Rose went to him, and laid down next to him and stayed beside him all night.....like she knew he was sick. She is 14, do you think her senses are somewhat shot, and she does not realize he is a different cat? I have mentioned that the 2 cats are the spitting image of each other, however, Bustopher is much younger looking then Bud was.....but I am now wondering, does she think he is the same cat? I guess one good "whiff" of Bustopher she will know, or maybe her senses are not spot on anymore. I just don't know anymore. I guess I got used to living with elderly cats.