Gray or Grey is a coat color of horses, consisting of black skin, and a hair coat that is white, dappled, or white intermingled with hairs of other colors. Gray horses are usually born bay, chestnut, or black, then white hairs begin to appear at or shortly after birth and "gray out" the horse. Graying can occur at different rates--very quickly on one horse and very slowly on another.
A gray horse whose hair coat is completely "white" will still have black skin (except under markings that were white at birth) and dark eyes. This is how most people can tell a gray horse from a white horse. White horses usually have pink skin and frequently have blue eyes.
"Until one has loved an animal, part of one's soul remains unawakened..."
- Anatole France