Great for training all dogs. With a high pitch and quiet to users the Acme 210 dog whistle is fitted with a weatherproof pea to provide the famous Acme trill of rolling notes or a variable frequency. A great whistle for close work and a different style of sound for a different command.
The Acme 210 whistle needs a good sharp blow. They will sound weak and ineffectual if they are blown in a gentle, drawn out way. They are designed to be on or off with no in between.