The grey color is just change of coat from summer to winter. I don't think that deer is piebald, rather that appears to be some hairless spots on the hide. He otherwise looks proportionate and healthy. Piebald is a genetic defect that normally coincides with other issues, disproportionate legs, snout, etc.
Exactly-the piebalds that I have seem killed-4,have all had obvious "defects ",roman noses and enlarged ankles being the most obvious.Not seeing any of that in the buck above.
