Largest Dog Breeds: English Mastiff
According to the American Kennel Club, the largest breed of dog is the English Mastiff, also known as the Old English Mastiff. Mastiffs are considered the heaviest dog breed, but not necessarily the tallest. They can weigh anywhere from 110 pounds to 343 pounds. The height of a mastiff can range from 25 inches at the shoulder to 36 inches.
In 1989, Zorba, an English Mastiff, broke records as the heaviest and tallest dog ever, with a weight of 343 pounds. Zorba measured over 8 feet from nose to tail and was said to be about the size of a small donkey. Hercules, a 282-pound English mastiff with a 38-inch neck, cinched the record in 2001 for World’s Heaviest Dog.