Information obtained from the 1998 Guinness Book of World Records
The tallest horse documented was a shire gelding named Samson. He was 21.2 1/2 hands high and weighed 3,360 pounds. He was bred by Thomas Cleaver of Toddington Mills, England, and was foaled in 1846.
The largest record mules are Apollo and Anak foaled in 1977 and 1976 respectively. Apollo measured 19.1 hands high and weighed 2,200 pounds, and Anak stands 18.3 hands high and weighs 2,100 pounds. Both are owned by Herbert L. Mueller of Columbia, IL, and were by mammoth jacks and Belgium mares. As of 1998 they were both still living.
Little Pumpkin is the smallest horse known. He stood only 14 inches tall and weighed only 20 pounds on November 30, 1975. He was foaled on April 15, 1973 and was owned by J.C. Williams of Della Terra Mini Horse Farm, Inman, SC.
The oldest horse reliably recorded was Old Billy. He lived to be 62 years old. He was foaled in 1760 and died in 1822. He was bred by Edward Robinson of Woolston, England.
The oldest pony reliably recorded was named Teddy E. Bear and lived to be 55 years old. He was owned by Kathy Pennington of Virginia Beach, VA. He was still alive in 1998.