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Is a horseshoe a horse's nail or a foot?
Toenails.

Horseshoe is the toenail of a horse. Horseshoe belongs to the skin (stratum corneum) of a horse. Horses that don't exercise often bend like nails that humans don't cut for a long time, which is easy to hurt horses, so horses need to run to maintain normal keratin loss.

Horseshoe is actually a kind of keratinized skin, which is equivalent to human nails. It is the fulcrum of the horse's weight and also protects the horse's limbs. However, horseshoes contact with the ground for a long time, which will be rubbed by the ground and corroded by accumulated water, resulting in uneven wear.

Wild horses don't need baggage to carry people, so this cuticle itself is enough to protect horseshoes, but domestic horses need heavy labor. If the horseshoe is not protected for a long time, the horseshoe will wear unevenly, which has a great influence on the horse's load-bearing capacity.

Extended data:

Horseshoe is divided into hoof edge, hoof crown, hoof wall and hoof bottom. The hoof margin is the hairless part between the hoof and the skin, which is about 0.5 cm wide and is semi-annular. The hoof crown is located below the hoof edge and above the hoof wall. There is a groove about 1.5 cm wide in the cuticle of the hoof crown to accommodate the dermis of the hoof crown.

The epidermis of hoof wall is the thickest, which can be divided into three layers: glaze layer, protective layer (crown layer) and horny lobule layer. Keratinous lobules are embedded between dermal lobules, so that the cutin of hoof wall is firmly combined with the dermis of hoof wall. Keratinous lobules can produce yellowish keratin, thus forming yellowish white line on the negative edge of hoof wall, also known as yellowish line.