When used properly and maintained, prong collars rarely come undone. However, in the event the links do separate, we want to be sure we maintain control of our dog. We recommend prong collar users to consider also utilizing a backup collar. This video explains how our backup collar system works and how we use a Leerburg Prong Collar Leash to get the best use of both our primary collar (prong collar) and backup collar (dominant dog collar).