| Equid | Horse Name ▲ | Breed | Age | Gender | Color | Discipline | Owner |
|---|---|---|---|---|---|---|---|
| 169719C | One Heckova Redhead | Paint Horse | SY19 (9yo) | Mare | Chestnut Tobiano | WW | Morrigan |
| 340419C | One Hot Luke | Quarter Horse | SY21 (7yo) | Stallion | Bay | WR | Soleil |
| 437819C | One Night Only | Quarter Horse | SY19 (9yo) | Stallion | Black | WW | Jewel |
| 347725B | One Part Wild CR | Quarter Horse | SY25 (3yo) | Mare | Red Dun Roan | WW | Morrigan |
| 371218C | One Slick Cookie | Quarter Horse | SY18 (10yo) | Mare | Grey | WE | Manders |
| 477015B | One Tough Catillac SLS | Quarter Horse | SY15 (13yo) | Stallion | Black | WW | Jewel |
| 166211C | Onomatopoeia | Arabian Pony | SY11 (17yo) | Mare | Grey | EV | Lissa |
| 433320B | Onweer M | Dutch Harness Horse | SY20 (8yo) | Stallion | Bay Sabino | CD | Soleil |
| 320318B | Onyx Heart | Thoroughbred | SY19 (9yo) | Mare | Black | DG | Soleil |
| 455524B | Oops a Daisy | Irish Cob | SY24 (4yo) | Mare | Black Sabino | CD | Soleil |
| 420423B | Opal Rift | Thoroughbred | SY24 (4yo) | Mare | Buckskin Sabino | FR | Lissa |
| 242411C | Open Sky | Quarter Horse | SY11 (17yo) | Stallion | Dunalino Roan | WW | Jewel |
| 418723B | Open To Questions | Thoroughbred | SY24 (4yo) | Mare | Bay Sabino | FR | Lissa |
| 089116S | Open To Suggestions | Irish Draught | SY16 (12yo) | Mare | Bay | HU | Morrigan |
| 054518B | Oppositional | Irish Sport Horse | SY18 (10yo) | Mare | Palomino | EV | Morrigan |
| 122712C | Optical Illusion | Thoroughbred | SY12 (16yo) | Stallion | Silver Perlino Overo | JP | Lissa |
| 058316S | Optimus Primo | Lusitano | SY16 (12yo) | Stallion | Classic Champagne | WE | Manders |
| 166111C | Opulence | Arabian Pony | SY11 (17yo) | Mare | Chestnut | EV | Lissa |
| 498424B | Oracle SW | Holsteiner | SY24 (4yo) | Mare | Chestnut | EV | The Orchard |
| 205722C | Orange Odyssey | Quarter Horse | SY22 (6yo) | Stallion | Chestnut | SR | Jewel |
| 125413C | Orange U Glad I Didnt Say Banana | Knabstrupper | SY13 (15yo) | Mare | Palomino Leopard | EV | Jen |
| 331521B | Orbital | Thoroughbred | SY21 (7yo) | Mare | Grey | CC | Lorelei |
| 270622B | Oregon Optics | Thoroughbred | SY22 (6yo) | Mare | Grey Overo | FR | Lissa |
| 148013C | Oregon Trail | Thoroughbred | SY13 (15yo) | Mare | Palomino | CC | Lissa |
| 327119C | Oriol | Hispano Arabe | SY19 (9yo) | Stallion | Grey | WE | Athene |
