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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.
At peak functioning, human ears can hear sounds at frequencies up to 20 kilohertz. Depending on size, breed, and age, the high end of a dogâs hearing ranges from 40 up to 60 kilohertz. The sound of the typical ultrasonic dog whistle varies between 23 and 54 kilohertz. Dog whistles work in the same ways that any other modes of training do, and for the same reasons; to wit, dogs are consistently trained to respond in a certain fashion to their use.