I recently introduced a female boxer into my home this past week. I've never had two dogs before so I'm not sure if this is normal behavior. Well, the new dog is more aggressive while playing and seems to be a little stronger than my male. For the past few days I've noticed that the female will stand in the middle of the hallway when my male decides to proceed into the living room. He'll turn around and walk back and lay next to me. He wont go past her. She'll also get in front of him if he's going into her direction, which causes him to stop and wait. Also, if I give attention to my male, she'll push him out of the way and prevent me from petting him and seek that attention from me. Any help and suggestions would be appreciated, thanks!