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Top Definition. dog whistle. Dog whistle is a type of strategy of communication that sends a message that the general population will take a certain meaning from, but a certain group that is in the know will take away the secret, intended message. Often involves code words.
This depends on the frequency of the whistle (I'm simplifying by assuming a single-tone whistle). The frequency of dog whistles is between 23 and 54 kHz [1]. This is a pretty wide range; I doubt that there is any non-trivial number of humans able to hear 54kHz, but 23kHz is within hearing range of most children. With age, as eardrums become larger and less flexible, sensitivity to higher frequencies drops off.