I concur with everyone else so far, you have to give it more time. My older ones didn't like the "new" guy either. So far I've got five and it was "hate at first sight", with each new one. Now they are getting along well, it's only been one week since I brought the 2 new boys home, and already I've seen improvements in attitudes. My oldest, Harley, he's eight, has just started to join in games of chase in the last day or so. Scooter is now their "personal trainer", he grabs a stick and takes them for a few laps around the backyard, loving every minute of it! Rita doesn't play with them but she has stopped growling and threathing to eat them for lunch, when they jump on her.