576 Shepherds Mouth Whistle Bite Resistant Plastic. Same as 575 in bite resistant plastic. Small shepherd mouth whistle. Ultra high tone. Shepherding whistle. This whistle is used to give commands to herding dogs that help herding sheep. It can be used for the sport called ‘Treibball’, originating in Germany. Built with a loop to attach to a lanyard. Size: 1.75" X 1.5" X .25"