| Name | Color | Sex | Year of birth | Microchip | Sire | Dam | Breed | Breeder |
|---|---|---|---|---|---|---|---|---|
| Your Witness | d.-bay | f | 1948 | Beau Pere | Juristic | Thoroughbred | USA | |
| Youre So Sweet | d.-bay | f | 2006 | Storm Cat | Angel in My Heart | Thoroughbred | USA | |
| Yours | bay | f | 1894 | Melton | Your Grace | Thoroughbred | Great Britain | |
| Yousefia | bay | f | 1989 | Danzig | Foreign Courier | Thoroughbred | USA | |
| Youth | bay | c | 1973 | Ack Ack | Gazala II | Thoroughbred | USA | |
| Youthful Lady | d.-bay | f | 1978 | Youth | Slew | Thoroughbred | USA | |
| 3951-6 Youwontseeme | chestnut | f | 2009 | Pulpit | Three of a Kind | Thoroughbred | USA | |
| Ypres | black | f | 1957 | Yildiz | My Rose | Thoroughbred | USA | |
| Yron Marschal | c | Thoroughbred | ||||||
| Yrrah Jr | bay | c | 1964 | Ribot | Ola | Thoroughbred | USA |