How good is a dogs sense of hearing?
Dogs can hear sounds that humans cannot. The human ear registers sounds from about 16 to 20,000 Hertz (sound waves per second), but a dog can hear sounds from about 70 to 100,000 Hertz. So-called silent dog whistles, for instance, make sounds that are just too high in the frequency range for us to hear — but at about 30,000 Hertz, is easily identifiable by trained hunting dogs from as many as 500 yards away.
