Aggressive Shih Tzu
I got a dog about a week ago and I spent over an hour with him and my other dog. Everything was fine my bf and her 3 year old daughter was there and it was fine, he didn't growl or anything but once I got him home he was a different dog as he tried to bite me and my sister. He has bitten my nephew twice for no reason even if you go to sit by him he will growl the same when we pet him. He is fine with my dog but not with people. What should I do I need help.