A "silent" dog whistle that makes sounds as high as 40,000 to 50,000 hertz takes advantage of a characteristic of sensory systems known as

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The use of high-frequency sounds in a "silent" dog whistle takes advantage of the absolute threshold, which is the minimum amount of stimulation necessary for a sensory system to detect a stimulus. In this case, the high-frequency sounds are beyond the range of human hearing (which typically extends to about 20,000 hertz), but can be detected by dogs whose hearing range extends up to 60,000 hertz.

A "Silent" Dog Whistle That Makes Sounds as High as 40,000