| Registered Name | Owner / Club | Status |
|---|---|---|
| Corroy Candy | Elaine Hanahoe Nephin | Approved |
| Corsillagh Dark Countess | Roslyn Byrne Castle Hill | Approved |
| Corskeagh Express (IRE) | John McDaid Donegal Gaeltacht | Approved |
| Cortown Lassie | Dianne Kelly Ard Lu | Approved |
| Cortynans Danny Boy | Shannon Wright Border Counties | Approved |
| Cosima | Sasha Smith Clonshire | Approved |
| Cosimo | Jennifer Maher Lismore | Approved |
| Cosmic | Clare Harrington Dunbyrne | Approved |
| Cosmic Click | Emily Vial Clonshire | Approved |
| Cosmic Rolo | Sharon McKeever Castle Leslie | Approved |
| Cossack | Martha Reid Calliaghstown | Approved |
| Costa Is Ainm Dom | Ali Murray Brooke Lodge | Approved |
| Costa Klover | Rena Ryan Newpark | Approved |
| Costaweefortune (IRE) | Claudia Culloty Clonshire | Approved |
| Cottage Taffetta Blue | Susan O'Connor Gap of the North | Approved |