What's the tallest horse in the world?

The tallest and heaviest documented horse was the shire gelding Sampson (later renamed Mammoth), bred by Thomas Cleaver of Toddington Mills, Bedfordshire, UK. This horse, foaled 1846, measured 21.2½ hands, 2.19 m (7 ft 2.5 in) in 1850 and was later said to have weighed 1,524 kg (3,359 lb).