According to the Guinness World Records, the tallest and heaviest documented horse was the Shire gelding Sampson, a.k.a. Mammoth, who stood measured 21.25 hands tall and weighed an astonishing 3,359 pounds. This was in 1850, and Shire horses are still known for being huge and muscular. But what other horse breeds can boast impressive heights and weights? We have identified eight of them. | Sunday Roast