I will just add a bit to this as my dog is also a show dog. I used one for a bit when my dog was on heat . And she started to move in a strange way, sort of kicking one leg out to much. So I stop using it. This may have gone unnoticed if she was not a show dog, but as we pay a lot of attention to how our dogs move, it was quickly spotted. So there is a chance that using a mill could effect the way your dog moves and this in turn could effect his hunting.