| Name | Color | Sex | Year of birth | Microchip | Sire | Dam | Breed | Breeder |
|---|---|---|---|---|---|---|---|---|
| Whatasassysong | grey | f | 2001 | Unbridled's Song | Electrostat | Thoroughbred | USA | |
| 5933-7 Whatdahell | d.-bay | f | 2015 | 643098510000294 | 0985-5 Ters | 3471-5 Waytolucky | Thoroughbred | Mr Buhtoyarov V.P. |
| Wheatly | chestnut | c | 1983 | Norcliffe | La Bonzo | Thoroughbred | USA | |
| Wheatly Way | d.-bay | f | 1989 | Wheatly | Family Way | Thoroughbred | USA | |
| Wheaton | chestnut | c | 1990 | Alydar | Terlingua | Thoroughbred | USA | |
| Wheedler | bay | f | 1943 | Umidwar | Miss Minx | Thoroughbred | Great Britain | |
| When in Rome | chestnut | f | 1951 | Roman | Now What | Thoroughbred | USA | |
| Where Music Is | bay | f | 1982 | In Reality | Rigid Princess | Thoroughbred | USA | |
| Where To | d.-bay | f | 1968 | Hidden Treasure | Doily | Thoroughbred | Canada | |
| Where To Dance | bay | c | 1985 | Northern Dancer | Where You Lead | Thoroughbred | USA |