Hercules: The World's Biggest Dog Ever According to  Guinness World
Records

Hercules was recently awarded the honorable  distinction of Worlds
Biggest Dog by Guinness World Records. Hercules is an  English Mastiff
and has a 38 inch neck and weighs 282 pounds.

With  "paws the size of softballs" (reports the Boston Herald), the
three-year-old  monster is far larger and heavier than his breed's
standard 200lb. limit.  Hercules owner Mr. Flynn says that Hercules
weight is natural and not  induced by a bizarre diet: "I fed him normal
food and he just grew".... and  grew. and grew. and grew.