2007 BEST-SELLER: Tri-Tronics Bark Limiter XS The Bark LimiterXS is much smaller, lighter than the previous Bark Limiter and still the most effective and reliable bark collar on the market. It provides very gentle but persuasive control of excessive barking. The Bark LimiterXS can be worn by even the smallest dog. The Bark LimiterXS dimensions are approximately 1.8" wide, 1" deep and 1" high, without contact points installed.