My "wake-up experience" was also with a male (pure bred) German Shepherd. I rescued him as a stray when he was a big puppy. He was extremely sweet and passive and always friendly around people and other dogs. I completely trusted him. One day (when he was about five years old) on a walk, when the trail was empty, I naively let him off his leash, trusting he would come back when I called. A young woman jogger approached some distance ahead, so I called him, but he ignored me and kept walking. I ran after him but didn't reach him in time. The woman, apparently, was afraid of dogs, because she got off the trail and stood very still with her back to the trail. I think my dog sensed her fear. He slowly walked up to her, wagging his tail, but she stayed quiet and frozen. I couldn't believe my eyes as he sniffed her and then very slowly and carefully nipped her buttocks, just barely breaking the skin. We were all extremely fortunate that it was a very minor wound, as he could have seriously injured her if he had wanted to. I was in shock, and although he weighed as much as I did, I threw him on the ground, spanked him and harshly scolded him. Then he, too, was in shock--cried and whimpered like a little puppy and wet himself to show submission because I was so furious with him. I had no idea why he bit her; it was totally bizarre and unprovoked. He was completely calm and nonchalant about it; never growling, barking or showing any obvious aggression toward her. The behaviorist told me that dogs can simply be "bullies" when they get the chance. I never let him off leash again, and worked with him to establish and maintain my dominance. He never attempted to nip anyone else. However, I was heartbroken to realize I couldn't trust him, or any other dog. MOO.