@Jeep2me My dogs wear a harness. When I take the two biggest ones (one at a time) somewhere, I also put a collar such as the one picturedIf I try to walk them with the harness, they just pull. When they have the chain on, they walk perfectly. I very rarely have to give it a tug, as they seem to know to walk properly when this is on. I have always trained all my larger(bullies on up)dogs with this collar. Used properly, it does not hurt them,you very rarely even have to give it a "tug".