There are many classification methods for leather. The most basic classification should be according to the different tanning agents used in tanning. But usually, consumers are used to different animal classification, so they are divided into different kinds of leather, such as pig, cattle, sheep, horse, donkey and kangaroo, and a small amount of fish, birds, reptiles and other animal leather.
Among them, cowhide, sheepskin and pigskin are the most commonly used: cowhide: the skin is thin and high strength, which is most suitable for making leather shoes and military leather goods. Further subdivided into cattle hide, buffalo hide and yak skin.
The inner pores of yak skin are more loose and irregular than those of cattle skin.
