My GSD was nippy. I looked like I was in a fight….and lost. So, after weeks of this losing battle I decided that when I had enough I just crated him. I walked him 35min. morning, 35min. evening. Play and train 15 minutes in a.m. and p.m. after work. I actually lost weight with all this activity. We bonded and he has settled down immensely although he is just about to turn 7mths in January. Every week is a new adventure. They are the centre of our lives and you can never give them too much attention. Just diverting his attention to activity worked for me. Its a dedication I wasn’t prepared for but I love it.