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Mastiff is a large powerful dog that has a droopy face who loves to drool on the floor and your clothes when she comes over for a pat. She is an extremely protective family member and will challenge all intruders but is the biggest sook to those she loves.

Hagrid's dog, Fang from the Harry Potter movies is the most famous mastiff in the world.
Hey man, that mastiff is massive, can I give her a pat?

Sorry dude, you can't,she doesn't like strangers.
by All in the mind July 01, 2016
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the biggest, best, and most badass of all dog breeds.
My mastiff is 10 months old and he already weighs 100 pounds.
by jenna leigh October 24, 2007
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