Wild horses are able to cover huge distances without any dire consequences. But the domestic ones might have some problems with their hooves, especially with the sensitive area of the frog. The infection of the wounded frog might even lead to lameness!The area of the frog is triangular shaped and actually covers a quarter of the underside of the hoof. The frog is a very important part of a horse's body: it decreases the force on joints of the entire leg.