I'm appalled to learn that prong collars are still widely available to buy.  They're cruel and inhumane and do not belong in today's society.   Dogs only  want to please and they react much better with love and through being rewarded.   Remember .... there are no bad dogs, only bad owners and the evil people who use them should be made to wear them themselves.   Let's get them banned for the sake of all the fur babies who deserve far better.