What does a dog whistle sound like?

A dog whistle (also known as silent whistle or Galton's whistle) is a type of whistle that emits sound in the ultrasonic range, which people cannot hear but some other animals can, including dogs and domestic cats, and is used in their training. ... To human ears, a dog whistle makes only a quiet hissing sound. read more

Trainers may use the whistle simply to gather a dog's attention, or to inflict pain for the purpose of behaviour modification. In addition to lung-powered whistles, there are also electronic dog whistle devices that emit ultrasonic sound via piezoelectric emitters. read more

Dogs are able to hear sounds of a much higher frequency than humans are, and the dog whistle creates one such sound. While a human can hear sounds around 23 kHz, dogs can hear sounds up to 45 kHz -- a significantly higher frequency. read more