I have a funny story, at least I think it is funny. An example of a PPD who is a little unclear of her job. A female GSD I had and ended up going to a Toronto Police officer. She (the dog) was first screened by John Cyd here in Ontario after I had raised her to 1 and a half years of age. It took one 5 minute session of me holding her lead and John approaching with a whip, not hurting or touching her, but snapping it near us and having me tell the dog WATCH. Oh my, she was ready to eat him, it was funny to see this in her because she was the sweetest dog in all ways and totally trustworthy with peolple, kids and dogs. But she had great prey drive. So I thought I would see where she could go. Here's the funny part - one day my car overheats and dog and I get out to walk home. A man pulls up and asks if I need help, I tell him no thankyou. He drives ahead and turns back. He stops ahead of us and gets out and approaches. He comes right up to us and insists he drive me home, kinda like he never saw the dog there, very strange. Well he grabbed my shoulder when I refused his invite and my sweet doggy took a chunk out of his leg. The police ended up checking hospital ER rooms to catch this guy but he did not show up at any. I loved that dog.
Oh I forgot funny part two - the officer in toronto who got her later, called me one night and asked two really funny questions. He asked why the dog was keeping him from getting in his bed at night, and why she jumped around crazy when he would wear his watch. LOL.
Her prey drive included chasing shadows and glitters of reflections, we all used to play with her with that, it was hillarious, but never a problem. Well then I had to explain to him that when she was a puppy she challenged me only one time, on my bed, I came to bed and she stood her ground growling on my bed and would not respond to my commands. So I called John and he said, "simple - go downstairs and get her a toy or food, when she leaves the bed get into it, it won't happen again." he was right. So to this day I still laugh picturing this poor man facing her in all her challenging glory in his bedroom.