1 of 39: FILE- In this Feb. 10, 2013, file photo, a pair of Neopolitan Bull Mastifs named Paparazzi and Ruben ride the elevator with their owners after checking into the Hotel Pennsylvania in New York ahead of the 137th Annual Westminster Kennel Club Dog Show. Although some larger breeds like the Bull Mastif, look imposing to some, eat lots of food and may suffer health issues that aren?t seen in smaller breeds, large breeds remain favorites among dog owners and the general public alike. (AP Photo/Kathy Willens, File) (AP Photo/ Kathy Willens)

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