Near the beginning of the 1990s, he formed the nom de course Dominion Bloodstock to purchase and race Thoroughbreds with partners Hugh Galbraith and Derek Ball.
In 2008, Cotey conditioned his second Sovereign Award winner, a horse named Mine That Bird he purchased for $9,500.
At age two, Mine That Bird raced at Woodbine Racetrack in Toronto where he won four of six starts.
David Cotey had believed in Mine That Bird so much that he nominated him for the Breeders' Cup Juvenile and the Kentucky Derby.
For his new owners, on May 2, 2009, Mine That Bird won the United States' most prestigious race, the Kentucky Derby.