That's called PIEBALD, for whatever reasons they had in those days

. They aren't uncommon, but you don't see one every day, either. I think they are more common than true albinos, since it's like albinism, it's a deformed gene or something that causes it. I suspect that they don't live too long, since they are a lot easier for a predator to see. I hear about one or two being taken during each deer season in Missouri, those are the first pics I've ever seen of one, though.
Really interesting markings on that doe's face, aren't they?
Build a man a fire, and he's warm for a day. Set a man on fire and he's warm for the rest of his life!