| Name | Color | Sex | Year of birth | Microchip | Sire | Dam | Breed | Breeder |
|---|---|---|---|---|---|---|---|---|
| Thoreau | d.-bay | c | 2008 | Gone West | Madame Thor | Thoroughbred | USA | |
| Thoris | chestnut | f | 1950 | Heliopolis | Miss Zibby | Thoroughbred | USA | |
| Thormanby | chestnut | c | 1857 | Windhound | Alice Hawthorn | Thoroughbred | Great Britain | |
| Thorn Apple | chestnut | f | 1937 | Jamestown | Last Straw | Thoroughbred | USA | |
| Thorn Dance | bay | c | 1986 | Northern Dancer | Barb's Bold | Thoroughbred | USA | |
| Thorn Flower | bay | f | 2007 | Montjeu | Champagne Cocktail | Thoroughbred | Canada | |
| Thorn Wood | bay | f | 1942 | Bois Roussel | Thoroughbred | Great Britain | ||
| Thoroly Blue | bay | f | 1967 | Blue Prince | Ambwithor | Thoroughbred | USA | |
| Thorough Fair | bay | f | 1993 | Quiet American | Very Fair | Thoroughbred | USA | |
| 1279-6 Thought I Forgot | bay | c | 2009 | 643094100120772 | Lemon Drop Kid | Captured Moment | Thoroughbred | USA |