Bernese mountain dog

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A dog of a large, muscular breed originating in the Bern Canton of Switzerland, having a thick, silky black coat with white and rust markings.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun large powerful long-haired black-coated Swiss dog with deep tan or russet markings on legs and white blaze and feet and chest marking; formerly used for draft