A dog's sense of hearing is highly developed and far more sensitive than that of humans. Dogs can hear a wide range of frequencies, which allows them to detect sounds at both lower and higher pitches than we can. On average, a dog's hearing range spans from around 40 Hz to 60,000 Hz, whereas humans hear in the range of 20 Hz to 20,000 Hz.
The distance over which a dog can hear a sound depends on several factors, including the frequency of the sound, the intensity of the sound, the dog's breed, age, and individual hearing acuity. Dogs can hear sounds from greater distances when those sounds fall within their more sensitive frequency ranges.
For lower-frequency sounds, such as a deep growl or a thunderstorm, dogs can detect them from a considerable distance, possibly several miles away under the right conditions. Higher-frequency sounds, like a dog whistle or a high-pitched voice, might be audible to dogs from a shorter distance due to the way high-frequency sounds tend to dissipate more quickly over distance.
It's important to note that a dog's hearing is not just about the distance they can hear sounds from. Dogs also have the ability to pinpoint the direction of a sound source with remarkable accuracy due to the slight time delay it takes for a sound to reach each ear.
Overall, a dog's remarkable hearing ability is a result of their evolution as hunters and their reliance on acute auditory senses to detect prey, predators, and potential threats.