This article is from the Mastiffs Breed FAQ, by mmcbee@access.mountain.net (Mike McBee) with numerous contributions by others.
No, Mastiffs come in Apricot, Brindle, and various shades of Fawn.
Since one of the faults listed in the breed standard is "excessive
white on the chest or white on any other part of the body", then a
Mastiff with much white on it at all is *not* correctly marked
according to the breed standard. There are breeds for which white
is a correct, acceptable color, but the Mastiff is not one of
them.
 
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