Explaining Nature on Instagram: "The heaviest dog ever recorded was Zorba, an English Mastiff from London who set a Guinness World Record in 1989. Weighing an astonishing 343 pounds (156 kg) and measuring over 8 feet (2.5 meters) from nose to tail, Zorba was more than just massive, he was the size of a small horse. Despite his intimidating appearance, Zorba was known for being calm, friendly, and gentle, embodying the classic temperament of the Mastiff breed. Other contenders for the title of he