My females have been doing that also. I had 1 female (Foxy) and then about 5 months later I got another female (Cookie) they got along just fine and then my pregnant female Foxy lost her litter (that was about 2 months ago) and now a few weeks ago Cookie came in season and was bred and is now exspecting puppies in July and they fight horrible I have to keep them in seperate rooms most of the time...unless I am in the room watching them.