I have a rottweiller, hes 3 years old about 130. Hes a complete suck in the house, with anyone. The second he goes outside hes vicious, completely different dog. Iam responsible enough not to let anyone get near him. This has nothing to do with my training, its the dogs instinct to guard and protect.
Adam, with no intended offense or question to your ability to care for a dog, did you try correcting this issue while he was young, or even now?