I was cornered in the neighbor's Wolf/GSD mix, Penny, when I was about 10 or so. I went over the fence to get a ball, and she wasn't supposed to be out, and suddenly, she was there, and I had to be rescued by her owners. She was pretty big, but not even remotely as big as another neighbor's purebred GSD, "Zonia" imported from Austria, she was the biggest one I have ever seen. But she was really mean. She bit the mailman up once and they had to pay him off. She lived to be very old, like 16 or 17 and seemed to be fine and just went to sleep and died in her doghouse one day. Her owners swore up and down they weren't going to get another dog, but a month later, they came home with a yellow Lab pup, who grew to be huge and one of my favorites in the neighborhood, he and my Beagle were big buddies.