| Breed | Active | Population | Highest Levelled |
|---|---|---|---|
| Cairn Terrier Group: Terriers | 77% | 5,441 | 107 Highest Retired: 105 |
| Canaan Dog Group: Drovers | 77% | 8,779 | 112 Highest Retired: 109 |
| Canadian Eskimo Dog Group: Draught | 78% | 11,404 | 111 Highest Retired: 109 |
| Cane Corso Group: Hunting | 76% | 12,327 | 103 Highest Retired: 98 |
| Cardigan Welsh Corgi Group: Drovers | 75% | 19,234 | 105 Highest Retired: 103 |
| Carolina Dog Group: Versatile | 77% | 7,554 | 93 Highest Retired: 94 |
| Carpathian Shepherd Group: Flock Guardians | 71% | 11,695 | 118 Highest Retired: 117 |
| Catahoula Leopard Dog Group: Drovers | 72% | 34,203 | 109 Highest Retired: 109 |
| Caucasian Ovtcharka Group: Flock Guardians | 76% | 19,801 | 106 Highest Retired: 112 |
| Cavalier King Charles Spaniel Group: Companions | 75% | 11,471 | 108 Highest Retired: 106 |
| Central Asian Shepherd Group: Flock Guardians | 70% | 32,459 | 106 Highest Retired: 107 |
| Chart Polski Group: Sight Hounds | 74% | 12,931 | 109 Highest Retired: 102 |
| Chesapeake Bay Retriever Group: Retrievers | 80% | 7,100 | 103 Highest Retired: 98 |
| Chihuahua Group: Companions | 72% | 24,712 | 108 Highest Retired: 110 |
| Chinese Crested Group: Companions | 76% | 13,348 | 102 Highest Retired: 101 |
| Chinese Shar-Pei Group: Versatile | 59% | 14,658 | 96 Highest Retired: 98 |
| Chinook Group: Draught | 75% | 11,622 | 99 Highest Retired: 100 |
| Chow-chow Group: Versatile | 77% | 7,864 | 109 Highest Retired: 113 |
| Clumber Spaniel Group: Spaniels/Flushers | 81% | 6,688 | 103 Highest Retired: 100 |
| Croatian Sheepdog Group: Drovers | 81% | 8,539 | 106 Highest Retired: 105 |
| Curly Coated Retriever Group: Retrievers | 77% | 7,190 | 100 Highest Retired: 99 |
| Czechoslovakian Wolfdog Group: Drovers | 80% | 16,086 | 101 Highest Retired: 101 |