I have a 3yr old full-blooded American Rottweiler Male. He is fine with both of my parents, and me most of the time. About two weeks ago he bit me and put about an inch deep hole in my arm and did not even growl at me or nothing he just did it. Now I can't even get close to him with out him growling, puting his tail straight up, and his hair standing up. I am the one that spends the most amount of time with him and I am the one that takes care of him. My dad does not want to get him fixed so that is not an option. Yes he needs more room to run but my dad will not sell or get rid of him. Even though I want to keep him I know that would be for the best if he went to a farm and "worked" and had more room to run. My mom & I wonder if it has anything to do with hormonal issues because I am 15, so we wonder if me and him both going through puberty at the same time has anything to do with this. Does anyone else know of anything that I can do because we can not keep living like this?