You Know How To Whistle…

When the shepherd is in the field with us, and wants to move us to a new pasture,  we will hear the shepherd whistle.  The whistle is a command the dog understands.  Each whistle is different.  There are short whistles, long whistles, very musical whistles, and single, double or triple whistles.  Whistles are a language shared by the shepherd and the dogs.  Can you whistle?