some people might be happy with their dogs not jumping at night while chasing,but not me.what if you have a fence in the middle of a massive field and the quarry decides to jump it while the dogs up its arse.would you be happy for your dog to stop and watch it run off .i remember seeing a big 27 inch dog running a deer (pre ban) jib because the deer jumped a 3ft fence .not my type of dog!