A foal of 1945 by Donald Truax out of Miss Pronto, Pronto Don was bred by W. R. Hayes of Hayes Fair Acres Stable in Du Quoin, Illinois. He was voted the 1951 Harness Horse of the Year. When he retired in 1955, his earnings totaled $332,363 - a record for that era. During his nine seasons of racing, Pronto Don started in 206 races and won 99; he was first, second or third in 158 races. He is best known for totally dominating the Transylvania Stake at Lexington, winning it five times. Other major wins included the Golden West Trot, Roosevelt two-year old Trot, and the Titan Free-For-All at Historic Track, Goshen, New York. Pronto Don, a gelding, was driven by some of harness racing's greats, including Sep Palin and Delvin Miller. Pronto Don died in 1976 at the age of 31 and is buried in the infield of the Du Quoin race track.
Published in the Harness Racing Museum's 1995 book, The 1995 Immortals