| O'chocobol'samour | β | 2018 | FR | β | LOF 630 | β Boyd's Bullriding El Dorado | β Alice Aus Enyy's Kelpie Familie |
| O'kdobol'amour | β | 2018 | FR | β | LOF 633 | β Boyd's Bullriding El Dorado | β Alice Aus Enyy's Kelpie Familie |
| O'malleybol'samour | β | 2018 | FR | β | LOF 631 | β Boyd's Bullriding El Dorado | β Alice Aus Enyy's Kelpie Familie |
| O.Ch. R Gr.Ch. Dual. Ch. (r) Callicoma Scarlet Runner Swe Swi Ccd. Ht Rae. Sprd.A Tdx. | β | 2022 | β | β | β | β | β |
| Obi-Wan Yooranah | β | 2015 | β | β | β | β | β |
| Obsydian Red Radimus | β | 2019 | PL | Red Radimus (Radochna IΕΕakowicz) | β | β Callicoma Thorin Red Radimus | β Cie Cib Ww-17 Ew-18 Pl Uch Pl Juch Ejw Scarlet Avalon Red Radimus |
| of Course Ned Star Red Radimus | β | 2019 | PL | Red Radimus (Radochna IΕΕakowicz) | β | β Callicoma Thorin Red Radimus | β Cie Cib Ww-17 Ew-18 Pl Uch Pl Juch Ejw Scarlet Avalon Red Radimus |
| Ogannayersrockbol'samour | β | 2018 | FR | β | LOF 635/167 | β Boyd's Bullriding El Dorado | β Alice Aus Enyy's Kelpie Familie |
| Oh No Jon Snow Red Radimus | β | 2019 | PL | Red Radimus (Radochna IΕΕakowicz) | β | β Callicoma Thorin Red Radimus | β Cie Cib Ww-17 Ew-18 Pl Uch Pl Juch Ejw Scarlet Avalon Red Radimus |
| On Fire Ygritte Red Radimus | β | 2019 | PL | Red Radimus (Radochna IΕΕakowicz) | PKR.I-92889 | β Callicoma Thorin Red Radimus | β Cie Cib Ww-17 Ew-18 Pl Uch Pl Juch Ejw Scarlet Avalon Red Radimus |
| One And Only Aria Red Radimus | β | 2019 | PL | Red Radimus (Radochna IΕΕakowicz) | β | β Callicoma Thorin Red Radimus | β Cie Cib Ww-17 Ew-18 Pl Uch Pl Juch Ejw Scarlet Avalon Red Radimus |
| One Brown Mount Mckinkey | β | 2021 | CZ | β | CMKU/AKE/679/21 | β | β Inge Black Mount Mckinkey |
| Onebol'samour | β | 2018 | FR | β | LOF 632/128 | β Boyd's Bullriding El Dorado | β Alice Aus Enyy's Kelpie Familie |
| Orchid Black Mount Mckinkey | β | 2021 | CZ | β | CMKU/AKE/680/21 | β | β Inge Black Mount Mckinkey |
| Osha Red Radimus | β | 2019 | PL | Red Radimus (Radochna IΕΕakowicz) | β | β Callicoma Thorin Red Radimus | β Cie Cib Ww-17 Ew-18 Pl Uch Pl Juch Ejw Scarlet Avalon Red Radimus |
| Ouijabol'samour | β | 2018 | FR | β | LOF 634 | β Boyd's Bullriding El Dorado | β Alice Aus Enyy's Kelpie Familie |
| Oumybol'samour | β | 2018 | FR | β | LOF 636 | β Boyd's Bullriding El Dorado | β Alice Aus Enyy's Kelpie Familie |
| Outbacklightnings Amazing Lilly | β | 2015 | β | β | β | β | β |
| Outbacklightnings Beasty Big Bee | β | 2017 | β | β | VDH 17/135 00248 | β | β Magic March Kelpiebrink |
| Outbacklightnings Beasty Brownie | β | 2017 | DE | β | VDH 17/135 00249 | β | β Magic March Kelpiebrink |