Originally Posted by ILoveMyThoroughbredSmokey
how can you tell the difference between a white and a horse that is gray which is finished being grayed out? Just curious!
Skin color- horses that are born white, either due to maximal pinto patterning or double dilution, will have pink skin. (Double dilutes will also have blue eyes, horses that are white from pinto pattern genes may or may not have blue eyes)
Gray horses are born some other color (bay, black, chestnut, etc.) with dark skin except under white markings. Even as they gray out, the dark skin will stay dark. On OP's picture you can see the pink skin under where a white marking was on his nose, and the rest of the skin is dark.