Have to say a word here about prong collars. They are wonderful tools in the right hands but when I have worked with animal rescue groups, I have seen the horrors (and serious damage) prong collars can do. There was one GSD at the local shelter that had the prongs imbedded into his skin and had to be surgically removed. The owner had obviously put the collar on him and never taken it off. After seeing cases like this, I cringe whenever I heard the words "prong collar".