I dont have opinion with using a electrical collar but waht I know, is doesnt matter, if is used for CsW or other races. Basicaly is recommended NEVER use electrical collar alone without any experiences with it. Electrical collar is one of the "extreme" training acessories and may be used only under supervision a good experienced trainer. Because have so strong effect for dog, can helps very much but on other side by wrong using can totaly destroyed the psyche of the dog. BE CARREFULLY !!!
Pavel
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