The largest and tallest horse on record was a Shire gelding called Sampson (later renamed Mammoth), who measured 21.5 hands and nearly 3,000 pounds (1360 kg) in 1846.

Thomas Cleaver bred him. The English Shire is the largest horse breed, and Sampson holds the Guinness World Record for not only being the largest Shire horse ever but also the largest horse ever ...