I found that when my shepherd reached adolescence they calmed down somewhat, especially my female. When I say calmed down I mean they stopped running over to other dogs in the park unless i said they could and stopped chasing children and joggers. However this is when they became destructive in the house. My youngest, Axel, has ripped the wallpaper, ripped the lino floor twice and also opens the bin and rips things up. However he has grown out of that now at 16 months.