| Jimboomba Power of Amber Stone | ♀ | 2026 | NL | – | NHSB3379730 | – | ♀ Jimboomba Whoopee Dreams Come True |
| Jimboomba Run To Me | ♀ | 2026 | NL | – | NHSB3379729 | – | ♀ Jimboomba Whoopee Dreams Come True |
| Jimboomba Whoopee Dreams Come True | ♀ | 2018 | NL | – | NHSB3142014 | – | – |
| Jimy Jack Devil of Highland | ♂ | 2023 | CZ | – | CMKU/AKE/795/23 | – | ♀ Chimi Changa Devil of Highland |
| Jo-Jo Black Mount Mckinkey | ♀ | 2017 | CZ | – | CMKU/AKE/450/17 | ♂ Apple Brown Rebell Represent | ♀ Fatal Black Mount Mckinkey |
| Joke for Mind Rebell Represent | ♀ | 2023 | CZ | Rebell Represent (Kristýna Nozarová Přibylová) | CMKU/AKE/858/23 | ♂ Empathic Commander Rebell Represent | ♀ Arrogant Grey Di Casa Hesselink |
| Joker Kelpiebrink | ♂ | 2010 | NL | – | NHSB2807143 | ♂ Almdalens Simon | ♀ Kiwi Kelpiebrink |
| Joko Dai Muratori | ♂ | 2023 | CZ | – | CMKU/AKE/817/23 | – | ♀ Hasty´s Hope Dai Muratori |
| Jolly Jasmine Kimbilio | ♀ | 2024 | CZ | Helena Kučerová | ČMKU/AKE/917/24 | ♂ Hilarious Hachicco Kimbilio | ♀ Gentle Geekii Kimbilio |
| Jolly Jeremiah Kimbilio | ♂ | 2024 | CZ | Helena Kučerová | ČMKU/AKE/916/24 | ♂ Hilarious Hachicco Kimbilio | ♀ Gentle Geekii Kimbilio |
| Jolly Joker Devil of Highland | ♂ | 2023 | CZ | – | CMKU/AKE/796/23 | – | ♀ Chimi Changa Devil of Highland |
| Jolly Jorika Kimbilio | ♀ | 2024 | CZ | Helena Kučerová | ČMKU/AKE/919/24 | ♂ Hilarious Hachicco Kimbilio | ♀ Gentle Geekii Kimbilio |
| Jolly Junia Kimbilio | ♀ | 2024 | CZ | Helena Kučerová | ČMKU/AKE/920/24 | ♂ Hilarious Hachicco Kimbilio | ♀ Gentle Geekii Kimbilio |
| Joul Xapatan | ♂ | 2014 | CZ | – | CMKU/AKE/280/14 | – | ♀ Foxy Xapatán |
| Jovie Journey Devil of Highland | ♀ | 2023 | CZ | – | CMKU/AKE/797/23 | – | ♀ Chimi Changa Devil of Highland |
| Joyce Dai Muratori | ♀ | 2023 | CZ | – | CMKU/AKE/822/23 | – | ♀ Hasty´s Hope Dai Muratori |
| Joytis Black Mount Mckinkey | ♀ | 2017 | CZ | – | CMKU/AKE/453/17 | ♂ Apple Brown Rebell Represent | ♀ Fatal Black Mount Mckinkey |
| Julissa Black Mount Mckinkey | ♀ | 2017 | CZ | – | CMKU/AKE/451/17 | ♂ Apple Brown Rebell Represent | ♀ Fatal Black Mount Mckinkey |
| Jumbo Roxy Xapatán | ♀ | 2014 | CZ | Jiří Tancer | ČMKU/AKE/279/14 | ♂ Vinny | ♀ Foxy Xapatán |
| Jumbo Roxy Xpatan | ♀ | 2014 | – | – | – | – | ♀ Foxy Xapatán |