Horses can be placed on this list for reasons of illness, overall soundness or fitness to race.
| Horse Name | Horse Breed | Date On | Track On | Date Off | Official Vet Exam | Work | Qualify | Vet List Type |
|---|---|---|---|---|---|---|---|---|
| Now Ya Want Me | Thoroughbred | Fort Erie Racetrack | No | X | ||||
| Noyzee Bear | Thoroughbred | Woodbine Racetrack | No | X | ||||
| Oh So Surprising | Thoroughbred | Woodbine Racetrack | No | X | ||||
| Ohmyshe'ssofine | Thoroughbred | Woodbine Racetrack | Yes | X | ||||
| Omegna | Thoroughbred | Fort Erie Racetrack | Yes | X | ||||
| One Lucky Woman | Thoroughbred | Fort Erie Racetrack | Yes | X | ||||
| One Night | Thoroughbred | Woodbine Racetrack | No | X | ||||
| Onezy's Dream | Thoroughbred | Woodbine Racetrack | Yes | X | ||||
| ONIMPULSE | Standardbred | The Raceway at Western Fair District | Yes | X | Long List | |||
| Ookpik | Thoroughbred | Woodbine Racetrack | Yes | X | ||||
| Oopsy | Thoroughbred | Fort Erie Racetrack | Yes | X | ||||
| Ostracism | Thoroughbred | Woodbine Racetrack | Yes | X | ||||
| Ourfirstorphan | Quarter Horse | Ajax Downs | No | X | ||||
| Out N Out Disgrace | Thoroughbred | Woodbine Racetrack | No | |||||
| OUTLAWSKYSTHELIMIT | Standardbred | Hanover Raceway | Yes | X | Long List | |||
| P S Charlie Brown | Thoroughbred | Fort Erie Racetrack | Yes | X | ||||
| Pacenza | Thoroughbred | Fort Erie Racetrack | Yes | X | ||||
| Paint the Meun | Quarter Horse | Ajax Downs | Yes | X | ||||
| Painting the Moon | Thoroughbred | Woodbine Racetrack | Yes | X | ||||
| Palace Ring | Thoroughbred | Woodbine Racetrack | Yes | X |