Horses in United States
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| Name | Last Run |
|---|---|
| Oompa Lewpa | Canterbury Park, 03-Aug-23 |
| Oondiri | Horseshoe Indianapolis, 24-Jun-26 |
| Oooh Barracuda | Gulfstream, 15-Jan-23 |
| Oops And Downs | Will Rogers Downs, 03-Mar-26 |
| Oops Haha | Tampa Bay Downs, 24-Jan-26 |
| Oopsie Doopsie | Mountaineer, 02-Sep-25 |
| Op Overlord | Finger Lakes, 05-Nov-25 |
| Opal | Laurel Park, 27-Oct-25 |
| Opaline | Hawthorne, 09-Jun-24 |
| Opeechee | Fort Erie, 13-Aug-24 |
| Opelucy | Will Rogers Downs, 01-May-24 |
| Open Choice | Wolverhampton, 17-Mar-24 |
| Open Court | Gulfstream, 05-Jul-26 |
| Open Flame | Oaklawn Park, 28-Feb-26 |
| Open Heart | Horseshoe Indianapolis, 13-Sep-24 |
| Open Lane | Gulfstream, 23-Jan-26 |
| Open Lengths | Philadelphia Park, 28-Jun-23 |
| Open Me A Peroni | Remington Park, 25-Apr-26 |
| Open Out | Mountaineer, 14-Oct-25 |
| Open Parole | Fair Grounds, 20-Jan-26 |
| Open Princess Corona | Turf Paradise, 18-Apr-25 |
| Open Road | Sunland Park, 02-Feb-24 |
| Open Sky | Gulfstream, 26-Aug-24 |
| Open Soul Autism | Belmont At The Big A, 28-Jun-26 |
| Open The Books | Pimlico, 19-May-24 |
| Open The Scrolls | Will Rogers Downs, 15-Oct-25 |
| Open Til Midnight | Belmont Park, 03-Jul-23 |
| Open To Question | Nancy, 04-Apr-26 |
| Opening Buzz | Gulfstream, 02-Jan-24 |
| Opening Hours | Charles Town, 30-Mar-24 |
| Openthegate | Gulfstream, 07-Jan-23 |
| Opera House A. D. | Gulfstream, 22-Jun-26 |
| Opera Singer | ParisLongchamp, 15-Sep-24 |
| Operation Overlord | Saratoga, 05-Jun-26 |
| Operation Sunrise | Churchill Downs, 28-Nov-25 |
| Operation Torch | Gulfstream, 14-Jun-26 |
| Operatnthunderbolt | Gulfstream, 20-Jun-26 |
| Operatore Pazzo | Churchill Downs, 07-Nov-24 |
| Ophelias Dream | Penn National, 21-Nov-24 |
| Ophir Gold | Los Alamitos Racecourse, 18-May-26 |
| Opie's Girl | Mahoning Valley, 29-Jan-25 |
| Opinionated | Laurel Park, 17-Dec-23 |
| Oppo Taco | Charles Town, 17-May-24 |
| Opportune Notion | Delaware Park, 24-Jul-25 |
| Opportune Notion | Delaware Park, 25-Jun-26 |
| Opportunity Set | Belmont At The Big A, 23-Jun-24 |
| Oppose | Colonial Downs, 28-Aug-25 |
| Opposite The Crowd | Penn National, 21-May-26 |
| Opposites Attract | Gulfstream, 27-Jun-25 |
| Oppy | Horseshoe Indianapolis, 23-Oct-25 |
| Opry | Mountaineer, 09-Oct-25 |
| Opt In | Fair Grounds, 21-Dec-25 |
| Optic Way | Monmouth Park, 09-Jun-25 |
| Optical | Churchill Downs, 06-Jun-26 |
| Optical Bijou | Monmouth Park, 08-Jun-26 |
| Optical Illusion | Los Alamitos Racecourse, 16-Mar-26 |
| Optimal | Fonner Park, 12-Apr-25 |
| Optimal Courage | Horseshoe Indianapolis, 30-Apr-26 |
| Optimal Trip | Fonner Park, 25-Apr-26 |
| Optimistic Cowgirl | Lone Star Park, 14-Jun-26 |