I have been watching a lot of youtube videos lately( I don't know why, they usually anger me) and I keep hearing all these protection trainers say they train PPD's not sport dogs. They say it so derogatory like sport dogs are not trained to bite. Now I have only visited a handfull of clubs from different protection sports but I really am not sure what they mean. Do the majority of protection sports not really train dogs to bite? What are some of the training differences between a PPD and sport dog? From what I see in videos is a lot of the same stuff being done. So now I'm confused. I figure it was on the internet so it must be true.