| Name | Doctor Day (US) |
| YoB | 1886 |
| Sex | horse |
| Colour | bay |
| Sire | Seneca Patchen (US), 1863 |
| Dam | |
| Damsire | |
| Breeder | Stewart L. Purdy |
| Birthplace |
| Doctor Day (US), 1886 | Seneca Patchen (US), 1863 | George M Patchen (US), 1849 | Cassius M Clay (US), 1843 |
| Dam of George M Patchen (US) | |||
| Toot (US) | Hollenbeck's Sir Henry (US) | ||
| Dam of Toot (US) | |||