Dog Whistle ! (2018)

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The advantage of the dog whistle is that it doesn't produce a loud irritating noise for humans that a normal whistle would produce,

so it can be used to train or command animals without disturbing nearby people.

Some dog whistles have adjustable sliders for active control of the frequency produced.

Trainers may use the whistle simply to gather a dog's attention,

or to inflict pain for the purpose of behaviour modification.

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