I have a 2 yr old GSD. He harasses other members of my family. Why is he doing this and how do I get him to stop if he is not behaving this way around me?

Hi,

I am confused about how to handle this. I have a 2 yr old GSD (90lbs). He has very very high prey drive and is very dominant. There is no question that I am pack leader. (He waits for me on stairs, in and out of doors, waits for food, he is obedience trained, etc). When I am home he tries to follow me everywhere and always wants to be with me. When I am NOT home he will sit at the top of the stairs in front of my room and wait. During this time, he WILL listen to everyone in the family BUT when I get home, he starts to test everyone. He will walk up behind them and nip (in a herding way), barks and lunges at them if they don't play or give him what he wants (sometimes there is no apparent reason for his behavior) - he does not back down. If I walk into the room to help he automatically lays down and stops. Why is he doing this and how do I get him to stop if he is not behaving this way around me? This is a new behavior - nothing has changed in his environment or schedule. I have your have pack structure and basic obedience DVDs and have read a lot of your articles. (the family members that he is doing this to have also read the articles & watched the DVDs) I am at a loss. How can I step in? I need to stop this before he accidentally hurts someone. His behavior is not aggressive - it is more prey/dominant?

Thanks for your help!

Dina