Horses can have unique body features consistent with a breed. We can spot these as features of a Thoroughbred, a Norwegian Fjord, a Morgan or a miniature horse from a distance.
Horses can also have body features unique to an individual. These include face markings (star, stripe, snip), hair whorls and defects, both congenital (sunken face, divots) and acquired (scars). I include these on identification papers.
These topics include some of the unique body features I have encountered in my practice.