Any list of the greatest racehorses of all time is going to include the speedy gray Lady's Secret, and when Blood-Horse Magazine released their "Top 100 U.S. Racehorses of the 20th Century," Lady's Secret came in at #76. She was was a smallish filly at around 900 pounds, but she had a heart as big as her head and backed down from no horse, male or female.
LW