| Breed | Active | Population | Highest Levelled |
|---|---|---|---|
| Cairn Terrier Group: Terriers | 77% | 5,412 | 107 Highest Retired: 105 |
| Canaan Dog Group: Drovers | 78% | 8,697 | 112 Highest Retired: 109 |
| Canadian Eskimo Dog Group: Draught | 78% | 11,335 | 111 Highest Retired: 109 |
| Cane Corso Group: Hunting | 76% | 12,279 | 103 Highest Retired: 98 |
| Cardigan Welsh Corgi Group: Drovers | 76% | 19,037 | 105 Highest Retired: 103 |
| Carolina Dog Group: Versatile | 76% | 7,532 | 93 Highest Retired: 94 |
| Carpathian Shepherd Group: Flock Guardians | 71% | 11,650 | 118 Highest Retired: 117 |
| Catahoula Leopard Dog Group: Drovers | 72% | 34,171 | 107 Highest Retired: 109 |
| Caucasian Ovtcharka Group: Flock Guardians | 76% | 19,686 | 106 Highest Retired: 112 |
| Cavalier King Charles Spaniel Group: Companions | 76% | 11,408 | 108 Highest Retired: 106 |
| Central Asian Shepherd Group: Flock Guardians | 70% | 32,172 | 106 Highest Retired: 107 |
| Chart Polski Group: Sight Hounds | 74% | 12,813 | 109 Highest Retired: 102 |
| Chesapeake Bay Retriever Group: Retrievers | 81% | 7,000 | 103 Highest Retired: 98 |
| Chihuahua Group: Companions | 72% | 24,461 | 108 Highest Retired: 110 |
| Chinese Crested Group: Companions | 76% | 13,265 | 102 Highest Retired: 101 |
| Chinese Shar-Pei Group: Versatile | 60% | 14,271 | 96 Highest Retired: 98 |
| Chinook Group: Draught | 75% | 11,641 | 99 Highest Retired: 100 |
| Chow-chow Group: Versatile | 76% | 8,061 | 109 Highest Retired: 113 |
| Clumber Spaniel Group: Spaniels/Flushers | 82% | 6,653 | 103 Highest Retired: 100 |
| Croatian Sheepdog Group: Drovers | 81% | 8,516 | 106 Highest Retired: 105 |
| Curly Coated Retriever Group: Retrievers | 77% | 7,199 | 100 Highest Retired: 99 |
| Czechoslovakian Wolfdog Group: Drovers | 80% | 15,997 | 101 Highest Retired: 101 |