Hi, I have 2 hungarian Vizsla's who love to play. They pin each other down and generally have a great time, however, they do this as soon as they are let out of an early morning and the commotion is rowdy. We bought 2 of the anti bark collars to keep them quiet of a morning. The first time we used them it took only one bark and they would not bark again as soon as the collars were put on them. The only problem was that they still played and grabbed each other by the throat and ended up chewing booth collars to pieces, strap and unit. We replaced both and continued but the elder dog immediately chewed the collar off the younger one again destroying it. because they worked so well and as soon as the collar was applied, you would not hear a boo out of them while the collar was on, we have purchased the 5th one and 2 days after getting it, it also was chewed. This time not as bad but when you put the battery in, the light flashed repeatedly. Not sure if it is working or not? Can you tell me if there is a non destructable one that may stand up to this? Regards. Rod G