I have a female who will be 3 in October and a male who turned 1 this past may. At any hint of excitement or play my boy goes at my female. If i take them to an open field she can't run 2 steps before he goes for her neck. She is so used to it she has learned a quick maneuver to dodge him. If we start talking to him and he gets excited he will go grab her even if she is sleep. If my kids run he will chase and give them a pretty good bite. Here is my confusion. When i brought my girl home she was your typical land shark pup. She tore ankles up and my kids wouldn't even play with her. She learned bit inhibition. When we brought our boy home he didn't bite at anyone or anything. So much so that I never taught him anything about not biting. Is he just hitting this stage late?