Does the Landseer or English Mastiff have a limited range of colors? 
Landseer (dog):  It is not to be confused with a white and black Newfoundland, which is also often called a "landseer". English Mastiff:  Distinguishable by enormous size, massive head, and a limited range of colours, but always displaying a black mask, the Mastiff is noted for its gentle and loving nature.
i don't know