First, horses can appear as a means of transportation in ancient times, and domestication is a very main reason, but it is inseparable from the strong limbs of horses. It is precisely because horses that serve people often need to carry people, pull carts and pull camels that they do a lot of walking exercises, and the wear of hooves and the ground is more serious. Coupled with the weight of those people and things, it will increase the burden of hooves, and horseshoes will be more worn. So people came up with a way to protect horseshoes, and put protective gear on horseshoes to protect them from being worn by dirt and stones on the ground. So people nail horseshoes into horseshoes. This horseshoe sounds a little cruel. Because in order to ensure the firmness of horseshoes, horseshoes are concave iron blocks with a certain thickness. People use nails to fix horseshoes firmly, which means that nails must be stuck in horseshoes.
Second, with human feelings, it is painful. However, the horse did not react much in the process of nailing horseshoes, because of the special structure of horseshoes. Because the horseshoe of a horse will wear on the ground because of its running habits, the horseshoe has exercised a kind of ability to protect itself. In addition to the living cuticle of horseshoe, there is another layer with a thickness of 3? The cuticle of cm is equivalent to the nails on our hands and feet, and can also be understood as protective nails or calluses. So nailing the horseshoe to the horseshoe will make the horse feel no pain.
Third, horseshoes appear. Horses with horseshoes run, and when they are pulled up, they have more power to grasp the ground, so they are not easy to roll over and their safety is improved. Of course, horseshoes are expensive, so horses that are not responsible for transportation and manned generally do not perform so well.