Question: Which dog is larger,the Tibetan Mastiff or the Boston Terrier?

<P0-S0> The Teddy Roosevelt Terrier is a small to medium-sized American hunting terrier. <P0-S1>  Lower-set with shorter legs, more muscular, and heavier bone density than its cousin the American Rat Terrier. <P0-S2>  There is much diversity in the history of the Teddy Roosevelt Terrier breed and it shares a common early history with the American Rat Terrier, Fox Paulistinha and Tenterfield Terrier. <P0-S3>  It is said the Rat Terrier background stems from the terriers or other dogs that were brought over by early English and other working class immigrants. <P0-S4>  Since the breed was a farm, hunting and utility dog there was little to no planned breeding other than breeding dogs with agreeable traits to each other in order to produce the desired work ethic in the dog. <P0-S5>  It is assumed that the Feist (dog), Bull Terrier, Smooth Fox Terrier, Manchester Terrier, Whippet, Italian Greyhound, the now extinct English White Terrier, Turnspit dog and or Wry Legged Terrier all share in the Teddy Roosevelt Terrier's ancestry. <P0-S6>  These early Ratting Terriers were then most likely bred to the Beagle or Beagle cross bred dogs (for increased scenting ability) and other dogs. <P0-S7>  Maximizing the influences from these various breeds provides the modern Teddy Roosevelt Terrier with a keen sense of awareness and prey drive, an acute sense of smell and a very high intellect. <P0-S8>  Although they tend to be aloof with strangers they are devoted companion dogs with a strong desire to please and be near their owners side at all times. <SEP> <P1-S0>  This "American Gentleman" was accepted in 1893 by the American Kennel Club as a non-sporting breed. <P1-S1>  Color and markings are important when distinguishing this breed to the AKC standard. <P1-S2> The Boston Terrier is a breed of dog originating in the United States. <P1-S3>  They should be either black, brindle or seal with white markings. <P1-S4>  Bostons are small and compact with a short tail and erect ears. <P1-S5>  The AKC says they are highly intelligent and very easily trained. <P1-S6>  They are friendly and can be stubborn at times. <P1-S7>  The average life span of a Boston is around 11 to 13 years, though some can live well into their teens. <SEP> <P2-S0> The Himalayan Sheepdog, also referred to as the Bhote Kukur or Bhotia, is a livestock guardian dog that originated from Nepal. <P2-S1>  This mountain dog breed is closely similar to Indian Mastiff and the Tibetan Mastiff and may be related to the long-haired Kinnaur Sheepdog of Tibet. <P2-S2>  Naturally, Himalayan Sheepdogs enjoy outdoor lifestyles and are rarely seen beyond the regions of India and Nepal. <P2-S3>  As a powerful and robust breed, the Himalayan Sheepdog is mainly used for herding purposes. <P2-S4>  The Himalayan Sheepdog is regionally popular as both a loyal companion as well as a working dog. <SEP> <P3-S0>  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. <P3-S1> The Tibetan Mastiff is a large Tibetan dog breed ("Canis lupus familiaris").