I have 8 bitches of varying ages 2 of them pups, they all live together as a pack and occasionally have a set to over the pecking order, its never nasty just a warning. I think its how you handle them that makes them what they are. If they dont get enough exercise or stimulation i could imagine you would have problems. Mine are hard work walking, training and stimulating them. In fact it is a full time job but we do have peace and harmony. .