wonderful dog collar shock collars are like flat collars but they tighten when the dog pulls. Even though they tighten, they are generally not used for giving a correction the way a choke chain is. Rather, they are used because they are less likely to slip over the dog's head when adjusted correctly than a flat collar is. These collars should be adjusted so that even at their tightest they cannot accidentally strangle the dog.
Another fact about the wonderful dog collar shock is that most people use them ineffectively because they are not that easy to use and there are some secrets that the old time professionals used to make them more effective and the correction stronger. First, these professionals make sure the length is right or you won't get the strong, quick pop. If the chain’s too long, when you go to give a correction, there’s too much slack. When it's too short, the collar tightens too quickly, before you’ve gained enough momentum in the jerk. Seasoned trainers also know that dog's feel the correction more if you can keep the wonderful dog collar shock up high, right behind the ears. That’s how Cesar Milan’s Illusion collar works. It keeps the collar positioned so that a correction can have the greatest effect (e.g. create the most effective jerk). Back when I was competing in obedience we didn't have Illusion collars and they wouldn't be allowed in the ring now anyway, but we did try to keep that wonderful dog collar shock up high when we were training. A third point, but one that’s the first thing a seasoned professional trains is that the wonderful dog collar shock has to go on the right way. It needs to form a “P,” with the tail of the “P” on the same side as the handler. You can tell right away when a force-based trainer isn't good at his wonderful dog collar shock technique because he doesn't even put the collar on correctly.