How do horses use smell and hearing to sense danger?

Horses rely on their keen senses of smell and hearing as essential tools for survival. Alongside their natural instinct, these heightened sensory capabilities allow them to detect potential threats, such as fire or distant danger, even when those hazards are not immediately visible.1

While the horse's primary defense mechanism is flight, its ability to perceive the environment is highly developed. The animal's auditory sense is particularly sharp, and horses possess an auditory memory that allows them to recognize and respond to specific sounds, a trait often utilized in training. By combining these acute sensory perceptions with their physical speed, horses have successfully survived as a species despite being historically vulnerable to predators.21