My neighbor has two German Shepard dogs. They keep them inside or let them run in their fenced-in-backyard. They are unbelievably quiet and I wouldn't hardly know they are there except for the fact that fairly often they somehow get out of their backyard and roam the neighborhood.
While clipping some brush next to my neighbors fence yesterday, it became clear how they get free.
He cracked me up! He just laid there for about 15 minutes watching Charlotte and me. "Good boy!" :-)