I've recently started to do e-collar conditioning with my male lab in a class that is held here. There is another unfixed male in the lab, same age, build everything. Every time we go to the class either my male or the other male will break and go after each other and start a scuffle. This is extremely frustrating for future events and duck seasons. I have socialized my lab, but for some reason every time we go to this class (even when he was not shocked) this is what happens. It has become quite an embarrassment. He has been socialized with many different dogs his entire life and even lives with an older female. We are going back to the basics (obedience) and that only. What else can I do to break this habit. I don't know what has gotten into him and it is killing me physically and mentally.