For people who aren’t familiar with horses A gray coat could
appear like white. Graying is the gradual silvering of hairs with
different colors, gray horses generally are dark-colored and have
skin that is black and the adult coat is either white, dappled or
mixed with different shades. White horses, however, are
distinguished by blue eyes and pink skin.
Gray horses could be any color when they are born. As they
age they lose their base color and are changed by hair of white.
In time the color shifts to iron-gray, rose, or dapple gray .
As the horses get older, the coat color will lighten to a pattern
of a flea-bitten gray or pure white