dog restraint

A dog whistle (also known as silent whistle or Galton's whistle) is a type of whistle that emits sound in the ultrasonic range, which humans cannot hear but some animals can, including dogs and domestic cats, and is used in their training. It was invented in 1876 by Francis Galton and is mentioned in his book Inquiries into Human Faculty and Its Development, in which he describes experiments to test the range of frequencies that could be heard by various animals, such as a house cat. Dog whistles were invented to explore auditory perception in animals and have since evolved into tools primarily used for dog training. The dog whistle has since evolved into a widely used tool in dog training, with commercial developments leading to more specialized and efficient designs.
References to dog whistles also appear in children's media, including cartoons and educational programming, where they are used as examples in discussions about sound, hearing, or animal behavior.

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