The biology of a dog’s ear compared to a human’s ear is quite different. Dogs also have a far wider hearing range than humans, allowing them to detect sounds far above a human’s auditory limit. One of the major differences in biology is the size and shape of the outer ear. This is the part of the sensory organ responsible for catching sound. Dogs have far bigger outer ears, which are also mobile, and dogs use 18 muscles located in and around the outer ear to rotate, raise or lower the ear to aid hearing. They can identify a sound and its location much quicker than humans, and can hear sounds four times as far away as humans.