| Name | Color | Sex | Year of birth | Microchip | Sire | Dam | Breed | Breeder |
|---|---|---|---|---|---|---|---|---|
| Yemen Desert | bay | f | 2003 | Sadler's Wells | Humble Fifteen | Thoroughbred | Ireland | |
| 1182-3 Yen Haven | bay | f | 1997 | 643098100036479 | Lear Fan | Heavenlyspun | Thoroughbred | USA |
| Yenna | bay | f | 1927 | Ksar | Yane | Thoroughbred | France | |
| Yentna | chestnut | f | 1938 | Hard Tack | Symphorosa | Thoroughbred | USA | |
| Yes Dear | f | 1963 | Prince John | Blue Moon | Thoroughbred | USA | ||
| Yes Dear Maggy | f | 1972 | Iron Ruler | Yes Dear | Thoroughbred | USA | ||
| Yes It's True | bay | c | 1996 | Is It True | Clever Monique | Thoroughbred | USA | |
| Yes Or No | bay | f | 2010 | 643094100120699 | Indygo Shiner | Hour Regal Lady | Thoroughbred | USA |
| Yes She's a Lady | chestnut | f | 2006 | Yes It's True | Wonder Lady | Thoroughbred | USA | |
| Yes She's Sharp | bay | f | 1984 | Sharpen Up | Yes Sir | Thoroughbred | USA |