| Name | Color | Sex | Year of birth | Microchip | Sire | Dam | Breed | Breeder |
|---|---|---|---|---|---|---|---|---|
| Whow | d.-bay | f | 1985 | Spectacular Bid | Hooplan | Thoroughbred | USA | |
| Why So Much | chestnut | f | 1987 | Northern Baby | Satiety | Thoroughbred | USA | |
| Whynot | br. | c | 1816 | Thoroughbred | Great Britain | |||
| Whynot | bay | c | Fenwick Barb | Royal Mare | Thoroughbred | Great Britain | ||
| Whywhywhy | chestnut | c | 2000 | Mr. Greeley | Thorough Fair | Thoroughbred | USA | |
| Wiasma | chestnut | f | 1845 | Hetman Platoff | Mickleton Maid | Thoroughbred | Great Britain | |
| Wichuraiana | chestnut | f | 1963 | Worden 2 | Excelsa | Thoroughbred | Great Britain | |
| Wichuraiana | f | 1943 | War Admiral | Fleur | Thoroughbred | USA | ||
| Wicked Kate | br. | f | 1792 | Thoroughbred | Great Britain | |||
| Wicked Kate | br. | f | 1792 | Thoroughbred | Great Britain |