The Boulder Bluff (BB) Shepherds Sheepdog Stock Plastic Lip Dog Whistle Border Collie Herding Livestock is an easy-to-use training whistle that is perfect for professional sheepdog handlers and shepherds. With its detachable Type-C cable, it is easy to set up and store. The BB Shepherds Sheepdog Stock Plastic Lip Dog Whistle Border Collie Herding Livestock is perfect for making your dog more responsive to your commands.