Why do people use choke/pinch/shock collars or martingale collars, why not just use a gentle leader? Or a harness that is anti pull that goes across the chest rather than the back? In my years of dog training , I have NEVER had to use Anything more powerful than a gentle leader or a anti pull harness, and the dog walks much better instantly, less pulling etc... And this method was tried on my husky and he loved to pull, but it worked. I just wonder if there is something I'm missing because I can't for the life of me figure out why people use these things. I want to volunteer with a gsd rescue, and they use these devices on the gsd as well, and i just dont get it, I think I'm missing something here.