audible dog whistle that had been in use for centuries. Both dogs and humans can hear at around 20,000 Hz. Dogs, however, can recognize sounds up to 45,000 Hz, a likely result of evolution ...

One of the mysteries of whistling is the silent dog whistle. I wondered exactly how they work. Obviously, they are silent so why can my dog hear a sound that I can’t? In hearing and audiology, Hz ...

Ultrasound close ultrasoundSound with a frequency greater than 20,000 Hz (20 kHz ... This explains why a dog can hear the ultrasound produced by a dog whistle but humans cannot.