Question

Reason for Use Silent Whistle to Call Dogs
Some people use silent whistle to call dogs. Why ?

Answer 1

some people use silent whistles to call dogs because those whistles are galtons whistle.this type of whistle is used to train the dogs. dogs can hear the ultrasonic sounds.In galtons whistle the frequency range is from 16000hz to 22000 hz the frequency range of a dog whistle is largely out of the range of human hearings.hence the dogs can hear the galtons whistle.