Well, we have melanism and albinism, so why not piebaldism?
Oh, right... Some of you don't know what piebaldism is. *ahem*
Piebaldism is kind-of like a weird blend of albinism and normal skin. It's where some parts of the body have missing pigments, resulting in that part being pure white. In animals, it looks like this:
EDIT: I have been told that the dog has a similar disorder called vitiligo; not piebaldism. So, to make up for it, have a cute piebald fawn.
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