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 temperament. The lineage of modern dogs can be traced back to the early 19th century, and the modern type was stabilised in the 1880s.
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20 Largest Dog Breeds http://top10dogpictures.com/20-largest-dog-breeds.html Tibetan Mastiff