Prong collars (also called 'pinch collars') are a series of chain links with blunted open ends turned towards the dog's neck. The design of the prong collar is such that it has a limited circumference unlike slip collars which do not have a limit on how far they can constrict on a dog's neck. The limited traction of the martingale chain combined with the angle of the prongs prevents the prongs moving close enough to pinch. The collar is designed to prevent the dog from pulling by applying pressure at each point against the dog's neck.
I bought one of their books which is fine... Really disliked how they give you the "free" Elite Dog Club for one month then automatically charge your card $37 a month after. I went on there anyways to check it out while it was free for me. Personally it wasn't something I would pay $37 a month for so I canceled the subscription before they billed me. During the 2nd step of the 3 step process to cancel they offered me a ONE TIME FEE OF $37 TO HAVE A LIFETIME MEMBERSHIP!!! This upsets me because I'm sure there are people that enjoy this site and these poor loyal customers are being taken advantage of.
A training class is not there to train your dog. Its purpose is to teach you to train your dog so you will need to be committed to train your dog for short sessions (5 minutes) several times a day rather than just simply turn up for classes! This little bit of training everyday will be repaid with a lifetime of living with a well behaved dog. You will also learn to avoid problems before they begin as well as receive help to overcome any that you already have with your dog.