Heaviest Dog - Zobra

According to the American Kennel Club, the largest breed of dog is the English Mastiff (also known as the Old English Mastiff). Mastiffs are the heaviest dog.

According to the Guniess Book of World Records, the worlds heaviest as well as longest dog ever recorded was an English Mastiff named Zorba. In 1989, Zorba weighed 343 lbs and was 8 feet 3 inches long from nose to tail! That same dog also holds the Guniess record for the Worlds's Largest Dog.