Becky and Heather, We just recently adopted a new girl who is going through the same issues with our two males we already had. Originally, Mittens ignored Lyssa (the new girl) and Joey tried to assert his dominance over her by rough play fighting. Joey finally got over this stage and we felt it would be ok to put Lyssa in the same cage as Joey and Mittens. Now, Joey and Mittens will try to share a hammock or sleep sack with Lyssa, but she will chase them out with much hissing and chattering. Sometimes Mittens gets really stubborn and sleeps in the front of the sleeps sack anyway. Lyssa will start screaming at him to get him to leave, but when he doesn't, she settles down and goes to sleep too. I think this is just a phase they go through and things will eventually settle down with everyone snuggling together. I would only worry if there is blood or a lot of "fear" pooping. Hope this helps! Natalie [Posted in FML issue 3405]