No they all get along fine. well... since we got molly pookie and molly seem to kinda hang out together and pookie doesn't seem to play with casper as much as he used to. But they still all get along. We got a dog 2 months ago and that REALLY freaked him out. But we got rid of the dog a month ago. I guess with the move and a new dog at the same time thats a lot of stress, but that was over a month ago.