I saw something on our reactive rovers walk that has upset and confused me. A lady (not in our walking group) Was walking a gsd puppy. I noticed her pinching the dogs rear end every so often, the dog visibly flinched every time. I plucked up the courage to ask her why, she said she is training him a reliable heel command. Every time there was tension on the lead she would pinch him. I was so upset I started shaking.