Curlin (foaled March 25, 2004, in Kentucky) is an American Thoroughbred racehorse and the highest North American money earner with over US$10.5 million accumulated. His major racing wins include the 2007 Preakness Stakes, 2007 Breeders' Cup Classic, and 2008 Dubai World Cup.Curlin was sired by Smart Strike, a former star from the Sam-Son Farm racing team in Ontario, Canada. Smart Strike is a half-brother of 1991 Canadian Triple Crown winner Dance Smartly.