Just like humans, too little exercise and too much food can lead to weight gain in pooches. The heaviest dog ever reported by the Guinness Book of World Records was Zorba, an English Mastiff, who ...

The average weight for an English Mastiff is 160-230 pounds for a male and 120-170 pounds for a female dog. They typically live between 6 and 10 years, the American Kennel Club says.