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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.
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.