Whistle

[Mortblanc]

I use one like that to irritate the he!! out of the next door neighbors pit bull.

I stand inside at the window and blow it and he spins in circles and bites his food dish. I do not have to blow it hard and no one but the dog can hear it.

Sometimes I do it just as the neighbor starts to pour the food. The dog nearly knocks him down and it looks like an old animated cartoon.