yea that's a Piebald doe , it's just a genetic defect that causes the pigment issue , most of the time (the three I've seen) the skin is actualy colored under the hair , this is the same thing that causes Pinto horses but with horses the results can be somewhat controled through selective breeding.
she looks realy good , often they will have a slightly differant bone structure like short nose and legs , excessively long tail or ears and sometimes spine issues.
whe shot one about 9 years ago off a piece of property that was being managed for trophy deer , the land owner was freaking out that his herd might be polluted with a bad gene so we went out and assassinated the little guy , this little buck had a seriouse over bite and very long tail , he was small and very skinny most likey due to not being able to eat properly