What is the rarest Newfoundland color?

Gray is the rarest Newfoundland color. Only 0.9% of Newfoundland dogs are gray.

Most Newfoundland dogs are black (74%), brown (16.2%), or white-and-black (9%).

The white-and-black Newfoundlands are actually called Landseers, but in the USA they are considered to be the same breed as Newfoundlands.