Lots of training is a start, helped me out a lot when my girl Tess was a puppy. Tess was a constant biter, from the moment I let her out of her crate in the morning......she'd run right toward me and start biting me. I tried everything with her, turning my back, leaving the room, saying "no bite", etc.... Teaching her basic commands would help somewhat but the biggest factor was her growing up. She is a year and a half now and a totally different dog. Yes, time is a huge factor when it comes to GSD's.