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A dog whistle works by emitting a high frequency tone in a range that a dog does not ordinarily encounter.  Through this training, many dogs will develop a conditioned response to respond in accordance with its training when it hears the tone.  The highest frequency a normal middle aged human can hear is 12,000-14,000 Hz, so don’t be alarmed if you can’t hear all of the tones yourself.  Please note that dogs may not have an intrinsic response to high frequency tones such as those used in this application.  One method is to adjust the frequency of the tone, while your dog is sleeping, until your dog’s ears perk up.  Dog whistle is a type of whistle used in the training of dogs and cats.  Dog whistles are typically used as part of a training routine designed to train your dog to do tricks or for behavior modification.  Recognize the possibility that success in dog training may not come as fast as you may anticipate, but relentless effort and consistency of commands will sooner than later reward you with success.  Our whistle has adjustable sliders for active control of the frequency produced.  Therefore, you must train your dog to respond to the tones much like you would train your dog to respond to verbal commands.  Normally, a dog whistle is within the range of 16000 Hz to 40000 Hz with only the frequencies below 20000 Hz audible to the human ear.  These high frequency tones have the effect of immediately getting a dog’s attention.  These kind of whistles are also used to determine the hearing range of people or for physics demonstrations.  A pure tone is much easier for a dog to distinguish compared to verbal commands.  Use treats to teach him that he did good! - Shut up a annoying dog that is barking. Just play a sound!  Dogs are capable of hearing sounds at much higher frequencies than people.