If the dog is trained with one they work very well.
Dog whistles inflict pain upon the dog with their high frequency noise. The use of dog whistles in dog training is cruel and archaic.
As with dog whistles they are used to give the dog commands.
yes
Yes! Dog whistles.
No; kangaroos do not respond to whistles. Anyone who attempts to convince others that there is such a thing is being deceptive.
Sonograms, dog whistles, Sonar.
Sonograms, dog whistles, Sonar.
Yes.
"no because a dog whistles frequency is so high that no person can hear it no matter how hard you blow" You could possibly hear some sound... most dog whistles work in the range of 16-22 kHz and the human hearing range tops out around 20kHz so if your hearing is very good it may be possible to hear the whistle's lower frequencies.
We can not hear dog whistles because they are far too high pitch (they are out of our hearing range). However, dogs can hear this and they respond to it as if it was a regular whistle, returning to their owner or turning their attention back to the owner. Dog whistles are also designed not to annoy other people.
a tree-though sometimes it whistles in the wind a sleeping dog
Because it whistles at a level he finds annoying That's why he chews on my tires