Zorba is the name of an English Mastiff from England, recognized by the Guinness Book of World Records as the heaviest dog in the world, at over 343 lbs (155 kg). Zorba stood 37 inches at the shoulder and was 8 feet 3 inches from the tip of his nose to the tip of his tail. Zorba set this record in November, 1989, when he was 8 years old. Pic 1 Pic 2