Young Blonde Girl With A White Top Riding On The White Horse In The Nature

White horses are born white and stay white throughout their life. White horses may have brown, blue, or hazel eyes. "True white" horses, especially those that carry one of the dominant white (W) genes, are rare. Most horses that are commonly referred to as "white" are actually "gray" horses whose hair coats are completely white.
True white horses
White horses have unpigmented skin and a white hair coat. Many white horses have dark eyes, though some have blue eyes. In contrast to gray horses which are born with pigmented skin they keep for life and pigmented hair that lightens to white with age, truly white horses are born with mostly white skin and white hair. Some white horses will have partial pigmentation in their skin and hair, which may or may not be retained as they mature, but if they lighten, unlike grays where only the hair becomes white, in a true white horse both skin and hair lose pigmentation.