Bold Reasoning

Bold Reasoning (1968–1975) was an American thoroughbred racehorse foaled in Florida. He was out of the Hail To Reason mare Reason To Earn, by the Santa Anita Derby winner Boldnesian, a son of Bold Ruler. Raced lightly, Bold Reasoning set a new track record at Belmont Park for 6 furlongs at 4. He is best known as being the sire of the 1977 Triple Crown winner, Seattle Slew.

Upon retirement, Bold Reasoning only produced three crops of foals at Claiborne Farm before his death on April 24, 1975, due to a breeding shed accident in which he cracked his pelvis. He had to be euthanized after the injury caused severe colic.