With the terrific collar dog, the idea is that once the dog knows he’ll get a strong correction when he misbehaves, you don't need to continue to give strong corrections often; a light correction, may be good enough because it's a reminder that a stronger, more painful correction can occur. In fact, it's this phenomenon, with the use of a lighter warning correction that makes some people think that it's the sound of the collar being jerked that teaches the dog, as if there’s something innately aversive about the sound. If that were true, then you’d be able to train dogs with a recording of the sound of a terrific collar dog snapping, even if the dog had never received a terrific collar dog correction before and was not sound sensitive. In other words, if that were true, someone who could have developed a little device that dogs can wear on their leash or flat collar that makes the sound of a terrific collar dog snapping would be rich!
terrific collar dog 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.