I have a 17 month old male GSD (Trigger) that my boyfriend and I adopted 5 months ago. We also have a 12 year old daughter. Over the past month or so, Trigger has begun biting my calves, ankles and/or feet whenver I sit down on the sofa to hang with my family. He doesn't go after them, just me. Also, he has begun going after my feet when I'm walking around the house, and nipping at the back of my calves, thighs and even butt when I'm walking away from him. Last night, after he went after me, I bit him on the ear. He yelped and was VERY confused, pacing in circles and just all out of sorts. I thought that would have helped, but he started doing it again. I try to distract him with chew toys as much as I can, but I'd really like to know where this is stemming from. As I said before, he DOES NOT go after my boyfriend or my daughter this way. I also am the main person who feeds him, brushes him and I'm very affectionate with him. He does listen to me as far as commands and is otherwise a very good dog.