I am not sure if i am even posting in the correct place but here goes. I just got an 11 mo old German Shepard. We have inly had him for two weeks. He has taken up with my 14 yo daughter and become very protective of her to the point he is starting to scare me. I went to hug her today and his ears stood up, he growled, showes be his teeth and snipped at my hand. I have two smaller kids and I really dont know what to do. I know i did not do enough research b4 buying him. My question is this. Is it too late for me to have professional help with his aggression? He is usually very sweet but in the back of my mind I keep thinking once a dog is aggressive can they ever be trusted?