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 |
|---|---|---|---|---|---|---|---|---|
| Meg Fitz | Thoroughbred | Woodbine Racetrack | No | X | ||||
| Mega Finale | Thoroughbred | Woodbine Racetrack | No | X | ||||
| Memories Times Six | Quarter Horse | Ajax Downs | No | X | ||||
| Mercurial | Thoroughbred | Woodbine Racetrack | No | X | ||||
| Mesaround | Thoroughbred | Woodbine Racetrack | Yes | X | ||||
| Mexican Groove | Thoroughbred | Woodbine Racetrack | No | X | ||||
| Mi Chiamo Stefano | Thoroughbred | Fort Erie Racetrack | Yes | X | ||||
| Mia's Rainbow | Thoroughbred | Fort Erie Racetrack | No | X | ||||
| Miahsolomiah | Thoroughbred | Woodbine Racetrack | Yes | |||||
| Midnight Affair | Thoroughbred | Woodbine Racetrack | Yes | X | ||||
| Midnight Brew | Thoroughbred | Fort Erie Racetrack | Yes | X | ||||
| Midnight Mascot | Thoroughbred | Woodbine Racetrack | No | |||||
| Midnight Rawks | Thoroughbred | Fort Erie Racetrack | No | X | ||||
| Mighty Gene | Thoroughbred | Woodbine Racetrack | No | X | ||||
| Mijo | Thoroughbred | Fort Erie Racetrack | Yes | |||||
| Millioninthemaking | Thoroughbred | Fort Erie Racetrack | No | X | ||||
| Milwaukee Saint | Thoroughbred | Woodbine Racetrack | No | X | ||||
| Mint Monster | Thoroughbred | Woodbine Racetrack | Yes | X | ||||
| Mipiace | Thoroughbred | Fort Erie Racetrack | No | X | ||||
| Mislight | Thoroughbred | Woodbine Racetrack | No | X |