question: Which dog is larger,the Tibetan Mastiff or the Boston Terrier?
answer: Tibetan Mastiff
context: Title: Lucky and Squash
  Passage: Lucky and Squash is an 2012 American children's book written by Jeanne Birdsall and illustrated with watercolor paintings by Jane Dyer published by Harper.  The two eponymous characters are dogs based on Birdsall's and Dyer's actual dogs, Cagney and Scuppers, a Boston Terrier and a Tibetan Terrier respectively.
  Title: Rock Dog
  Passage: Rock Dog ( literally "Rock and Roll Tibetan Mastiff") is a 2016 computer-animated comedy film produced by Mandoo Pictures and Huayi Brothers.  The film is directed by Ash Brannon, written by Brannon and Kurt Voelker, based on the Chinese graphic novel "Tibetan Rock Dog" by Zheng Jun.  It features the voices of Luke Wilson, Eddie Izzard, J. K. Simmons, Lewis Black, Kenan Thompson, Mae Whitman, Jorge Garcia, Matt Dillon and Sam Elliott.  The film follows a young Tibetan Mastiff who leaves his home village in the mountains to become a rock musician in the big city after a radio falls from the sky.
  Title: Mastiff
  Passage: Mastiff type means a large molosser dog.  The term "mastiff type" has been used synonymously with the term "molosser".  For example, the bulldog breeds, the Great Dane, the mountain dogs, the pit bulls and even smaller dogs such as the Boston terrier, may be considered "mastiff types" in this broad sense.  The descriptive term, mastiff type, should not be confused with the breed, the Mastiff.  All breeds are individual and should be referred to by their breed name to ensure correct identification.
  Title: Tibetan Mastiff
  Passage: The Tibetan Mastiff is a large Tibetan dog breed ("Canis lupus familiaris").  Originating with the nomadic cultures of Tibet, China, India, Mongolia and Nepal, it's used by local tribes of Tibetan to protect sheep from wolves, leopards, bears, large mustelids, and tigers.
  Title: Boston Terrier
  Passage: The Boston Terrier is a breed of dog originating in the United States.  This "American Gentleman" was accepted in 1893 by the American Kennel Club as a non-sporting breed.  Color and markings are important when distinguishing this breed to the AKC standard.  They should be either black, brindle or seal with white markings.  Bostons are small and compact with a short tail and erect ears.  The AKC says they are highly intelligent and very easily trained.  They are friendly and can be stubborn at times.  The average life span of a Boston is around 11 to 13 years, though some can live well into their teens.
citations: Tibetan Mastiff Boston Terrier