575 Shepherds Mouth Whistle Nickel Silver. Insert in the mouth and manipulate with the tongue. Produces a widely varying and easily controlled range of pitches popular at sheep dog trials. 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. Small with ultra high tone. Size: 1.75" X 1.5" X .25"