| Term | Definition |
|---|---|
| Daily Double |
This wager requires selecting the winners of two consecutive races, generally the first and second race of the day. |
| Dam |
The female parent of a foal. |
| Dead heat |
When the photo-finish camera shows two horses inseparable at the finish, the race is declared a "dead heat" or tie. |
| Disqualification |
When officials order a change in the order of finish in a race for an infraction of the rules, there is a disqualification. |
| Driving |
When a horse is running under extreme pressure, he is said to be "driving." |
| Dwelt |
A horse that is slow in breaking from the starting gate is said to have "dwelt." |