Our 14 week old puppy Harper has been awesome except for a few challenges we have had lately. The biting has been very hard to deal with, which I have had puppies before but this is my first doberman so I had NO idea about. I took a lot of comfort in reading how other doberman owners have handled it (holding their mouths closed or holding them by the collar until they settle down) The trainer I had over to do some initial one on one training suggested I crate her for 15-20 seconds since she was looking for attention. That wasn't feasible since #1 she was in there all the time and #2 it's happening in the backyard too so taking her inside to crate her when I am trying to potty train her wasn't working. Well this morning we had a new thing happen. I had bought her a "busy bone" not an actual bone its soft so it doesn't hurt her teeth and it has two treats on either side, it keeps her busy while I am getting ready in the morning. My 11 year old daughter walked by her and she growled and barred her teeth. My daughter was just leaving the room not bending down or anything or even acknowledging the dog. Harper had had breakfast and treats that morning so it wasn't like she was overly hungry. I went over, and she did the same to me. I grabbed her collar to correct her and she went nuts! Snarling and acting really aggressive. I put her on her back/side and held her mouth (not tight just closed with my thumb and index fingers) and she continued to snarl and growl. I was talking to her calmly and telling her to calm down and she went on like that for 3 minutes. I finally let her up. She went back to her toy. After awhile (5 minutes or so) she came over with the bone/toy and was close but by this time i was scared to reach for it. HELP. I don't want to worry about her or worry that she may go after my daughter or the woman that walks her has a daughter as well that she brings. I know she is young but I want to NIP (no pun intended) in the bud now before she gets too big.