Notes on Halter:  The halter places control of your dog around his center of gravity rather than his head or neck.  This method moves the training cues from the head and neck to the dog’s body. This utilizes a dog’s instinctive push/pull reflex called the opposition reflex - a dog's natural inclination is to move toward pressure. This reflex is why so many dogs pull while on leash - as you pull, they pull back.