Gray or grey is a of characterized by progressive silvering of the colored hairs of the coat. Most gray horses have black skin and dark eyes; unlike many depigmentation genes, gray does not affect skin or eye color.

Their adult hair coat is white, dappled, or white intermingled with hairs of other colors. Gray horses may be born any base color, depending on other color genes present. White hairs begin to appear at or shortly after birth and become progressively lighter as the horse ages. Graying can occur at different rates—very quickly on one horse and very slowly on another.

Gray horses appear in many breeds, though the color is most commonly seen in descended from ancestors. Some breeds that have large numbers of gray-colored horses include the , the , the , the , the , the , and the most famous of all gray horse breeds, the .

People who are unfamiliar with horses may refer to gray horses as "white". However, a gray horse whose hair coat is completely "white" will still have black skin (except under that were white at birth) and dark eyes. This is how to discern a gray horse from a . White horses usually have pink skin and sometimes even have blue eyes. Young horses with hair coats consisting of a mixture of colored and gray or white hairs are sometimes confused with . Some horses that carry may also be confused with white or gray.

While gray is commonly called a coat color by , genetically it may be more correct to call it a pattern. It is a , and thus a horse needs only one copy of the gray , that is, , to be gray in color. A gray horse, one carrying two gray alleles, will always produce gray foals. 

Dapple grey is my favorite breed :D

AC out