I have three females - ages 9, 7, 4 and 11 months. The 9 year old is the mother of the 7 year old. As suggested above, practice pack leadership and stop any squabbles before they begin. Never had a fight, but occassionally one may snap over a toy, etc. I don't allow toys, bones, etc in the house or yard unsupervised. Dogs are in their seperate kennels when I am not at home although the mother/daugher share the same kennel. When I board them they need to be next to each other as the kennel personnel tell me they scream the place down if seperated.