I have a question about females coming into heat, do they become aggressive? I noticed that Lani has gotten more aggressive the last couple of days. Last night she began biting at Toby's back while he was chewing on a bone and pulled out a couple mouthfulls of hair before I could stop her. She is almost 11 months old and has not come into heat yet. And it seems all she wants to do at times hump Toby. Just curious. :?