The traditional way these remarkable military dog collars are used by professional trainers is to give a sharp jerk—strong enough to make the dog stop what it's doing and do something else. For instance, if the dog starts to sniff and pull on a walk, you quickly brace yourself and give a quick yank in the hopes that the dog feels it enough to stop pulling. My first trainer told us to generate enough strength by actually running full speed in the opposite direction so that my, then 76 pound boxer, would feel a strong enough pop! The next trainer I had taught me to first attach the leash to a fence so that I could practice the technique and get it right before I tried it on the dog. The technique was a lot like karate where you have to twist your hip to get enough power for your body and so that you can get the timing of the correction right. Most trainers do not give owners practice on a fence first. They just let owners make a lot of mistakes on the dog.
The next step in training dogs with a head collar is to train them that when they reach the end of the leash they are going nowhere. That means the owner must hold perfectly still and avoid taking a step or even moving the leash-holding hand. Once the dog figures out that pulling harder does not work and instead steps back or turns to the owner such that the leash is hanging loose, then the owner can resume walking. Better yet, the owner can reward the dog with a treat so that dog comes all the way back to her and then they can resume walking forward. It's important that the dog learn that a tight leash and the associated pressure created means she should stop. If the dog is not taught this and tends to act impulsively, she may dart out after a cat or other object and hit the end of the leash with some speed. This type of accident could potentially cause neck pain or injury. Even in the emergency situation, if the owner is paying attention, they can prevent neck wrenching if they gradually tighten the leash rather than letting the dog dart forward on a loose leash so that she suddenly hits the end.