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www.psychologytoday.com/us/blog/canine-corner/201511/are-silent-dog-whistles...

If we extended the keyboard to match a dog's hearing, we would have to add 52 keys — and the last 24 of these would produce sounds that were so high-pitched that humans cannot hear them.

dogcare.dailypuppy.com/there-high-pitched-whistle-make-dogs-stop-barking...

Dog whistles are useful for two main reasons: They are distinctive and they are loud. ... The whistle, with its distinct, high-pitched tone, will get your dog’s attention. It will make him stop barking, even just for a few seconds, because it removes his attention from the stimulus causing him to bark. That is the crucial window of opportunity.

www.dogsloversblog.com/best-dog-whistles

HEHUI dog whistle is designed to produce various frequencies, adjustable pitch, simply tighten or loosen the screw to work out your dog’s frequency. This Silent Dog Whistle produces a variety of high-pitched notes that only your dog can hear.

doglab.com/dog-whistle

Acme’s 210, 210.5 and 211.5 dog whistles produced high-pitched sounds, increasing in frequency as the number increases. They were easy to blow. However, they were edged out by the Acme 212. The Acme Tornado was more cumbersome to use than a traditional whistle.

blog.sfgate.com/white/2020/10/13/dog-whistles-and-virtual-gala-mention

In my world, a dog whistle is an actual high-pitched whistle, inaudible to the human ear, used to train and signal dogs. Come to think of it, since humans can’t hear it and it’s used for ...

www.orangefreesounds.com/dog-whistle-online

Description: Dog Whistle Sound Online – high pitch frequency 20 kHz .For dog’s ears ONLY.. The range of human hearing is up to 20 kHz, while dog’s hearing range goes up to 45 kHz.. So, your dog hears frequencies that human ear cannot. You can try to listen online, but if you are human you have no chance, except possible headache 🙂

wagwalking.com/behavior/why-dogs-dont-like-high-pitched-noises

Being as crafty as humans can be, we have crafted devices that can replicate these higher pitched sounds to be used for training tools. The most well known of these tools may be the dog whistle. A dog whistle produces a high-frequency sound that can barely be heard to the human ear but cuts through the sky and is heard far away by a dog.

pets.thenest.com/cant-humans-hear-dog-whistles-12016.html

A sound's pitch is measured in hertz -- 1,000 hertz is equal to a kilohertz. The lower the number, the lower the pitch. Humans can detect sounds up to around 23 kHz, but dogs can hear them up to around 45 kHz. This means that when you blow into your high-pitched dog whistle, he can hear it, but your ears just aren't built to do the same.

www.merriam-webster.com/words-at-play/dog-whistle-political-meaning

Dog ears can detect much higher frequencies than our puny human ears can, so a dog whistle is nothing more than an exceedingly high-pitched whistle that canines can hear, but that we cannot. Figuratively, a 'dog whistle' is a coded message communicated through words or phrases commonly understood by a particular group of people, but not by others.

www.cuteness.com/article/audio-frequencies-painful-dogs

High-pitched noises from the motor that humans can't perceive is probably the issue. This makes it pointless to force your dog to be in the room, hoping he'll get used to it. Audio frequencies that hurt a dog's ears can be damaging as well as uncomfortable, according to Psychology Today .