Why can horses run very fast?

Answer 1

Because their feet are built like a sprinter's. Sprinters only use the balls of their feet to run on, not the whole foot, leaving less surface area to land on and a smaller area (and more buoyancy) to go off of. Horses' hooves are not cloven, but only a single hoof, and through the process of evolution, have developed so that they are quit literally standing on their tippy toes, much like a human sprinter does when he's sprinting. Muscle power in the shoulders and flanks also help power horses to run as fast as 50 mph in short fast bursts, but not maintain that speed for very long.

Answer 2

Yes they do!