| Prince John|
Summing (April 16, 1978 – October 10, 2008) was an American thoroughbred racehorse and sire.
He was sired by stakes winner Verbatim out of the Never Say Die mare Well Kept.
Until the detection of a blood infection, Summing performed so poorly that he was dropped from graded stakes races and entered in an allowance race. Once the infection was found, he was unable to compete in the Kentucky Derby and the Preakness Stakes, although two weeks before the Belmont he was well enough to win the Pennsylvania Derby.
Trained by Luis Barrera, brother of American Hall of Fame thoroughbred racehorse trainer Laz Barrera, Summing is best known for his upset over U.S. Champion 3-Yr-Old Colt Pleasant Colony in the Belmont Stakes with George Martens aboard. He won the race in a time of 2:29, spoiling Pleasant Colony's bid for the Triple Crown, as Pleasant Colony ran wide in the turn and placed third, behind Highland Blade.
In the fall, Summing won the Pegasus Stakes, then finished second in the Super Derby.
Summing was retired to Jonabell Farm, where he stood at stud until from 1982 to 1991. He was then sent to Getaway Farm in California. Summing was pensioned from study duties in September 2003 due to declining fertility and stood at the farm until he died in his sleep of natural causes at 30 years old in October, 2008.
His graded stakes race progeny include Epitome, Summer Matinee, and Matthews Keep.