If you mean the American breed of cart horse, they are usually chestnut.
Horses are different colors because different kinds of horses are naturally different in color. Some horses were also bred to be certain colors.
Tennessee Walking Horses can be nearly every color horses naturally are.
Disease.
They are only black. If they have any other colors on them they cannot be registered.
sea horses can change to all of the colors of the rainbow
black white brown
brown and cream colored
all colors of horses
It's hard to say -- but people say horses can only see the colors purple, green, blue, and orange.
All horse colors can become grey.
No.
Black, Bay, & Brown