Measure the size and choose the right collar for your dog
A good collar will never puncture your dog's skin.
Purchasing the right kind of prong collar lessens the likelihood your dog will experience pain while wearing it.
Quality prong collars are designed to gently pinch the loose skin around the dog's neck, providing negative reinforcement in the event of pulling and misbehaving.
The right size is important. Collars are divided by weight distinction, so know how much your dog weighs before selecting a collar.
Stop using the collar once your dog no longer needs it.
Prong collars are not meant for longterm use. Working with a certified trainer, get your dog to a place where he has learned proper leash manners and no longer pulls. Once your dog has mastered good walking techniques, you no longer need to use the collar.