Some of my clients ask if using a prong collar is humane and effective. My answer is no. A prong collar creates opposition reflex which causes your dog to pull in the opposite direction of pressure.
When you put a prong collar on your dog and he pulls, the collar tightens and pinches his neck, inflicting pain. You could make the argument that this is positive punishment (a quadrant of operant conditioning) because you are adding something (pain) to decrease the action of your dog pulling on his leash. I would agree, but I would not agree that it is effective.
Watch this video and tell me what you think? Are you willing to try a prong collar on yourself before you use it on your dog? If you tried on prong collar on yourself, did it change your mind about using it on your dog?