Dogs can hear sounds over a far wider range of frequencies than humans. A dog's hearing sensitivity depends on the frequency range. Some dogs can hear up to a million times better than humans. They can hear about 4 times the distance of a human with normal hearing. Dogs can also move their ears independently to locate the source of the sound and catch the maximum amount of sound waves. My dogs are very familiar with the sound of the vet's car. They start barking about 10 minutes before his car appears in front of the house.
