Why can a dog or cat hear a whistle that a human cannot?
A dog’s sense of hearing is highly developed. While a human can hear sounds from a hundred yards away, a dog can hear sounds from over 440 yards (402 meters) away. Moreover, dogs and cats are capable of hearing ultrasonic sounds—sounds that are beyond the range audible to humans. The maximum frequency of sound that humans can perceive is approximately 20,000 cycles, or 20 kilohertz, per second. It has been demonstrated that a dog can perceive at least 35,000 cycles, or 35 kilohertz, per second and a cat can even hear as high as 65,000 cycles, or 65 kilohertz, per second.
