| Breed | Active | Population | Highest Levelled |
|---|---|---|---|
| Cairn Terrier Group: Terriers | 76% | 5,452 | 107 Highest Retired: 105 |
| Canaan Dog Group: Drovers | 77% | 8,768 | 112 Highest Retired: 109 |
| Canadian Eskimo Dog Group: Draught | 78% | 11,401 | 111 Highest Retired: 109 |
| Cane Corso Group: Hunting | 76% | 12,373 | 103 Highest Retired: 98 |
| Cardigan Welsh Corgi Group: Drovers | 75% | 19,350 | 105 Highest Retired: 103 |
| Carolina Dog Group: Versatile | 77% | 7,572 | 93 Highest Retired: 94 |
| Carpathian Shepherd Group: Flock Guardians | 71% | 11,739 | 118 Highest Retired: 117 |
| Catahoula Leopard Dog Group: Drovers | 72% | 34,031 | 109 Highest Retired: 109 |
| Caucasian Ovtcharka Group: Flock Guardians | 76% | 19,859 | 106 Highest Retired: 112 |
| Cavalier King Charles Spaniel Group: Companions | 75% | 11,506 | 108 Highest Retired: 106 |
| Central Asian Shepherd Group: Flock Guardians | 70% | 32,467 | 106 Highest Retired: 107 |
| Chart Polski Group: Sight Hounds | 74% | 12,955 | 109 Highest Retired: 104 |
| Chesapeake Bay Retriever Group: Retrievers | 79% | 7,296 | 103 Highest Retired: 98 |
| Chihuahua Group: Companions | 72% | 24,874 | 108 Highest Retired: 110 |
| Chinese Crested Group: Companions | 76% | 13,352 | 102 Highest Retired: 101 |
| Chinese Shar-Pei Group: Versatile | 59% | 15,042 | 96 Highest Retired: 98 |
| Chinook Group: Draught | 75% | 11,581 | 99 Highest Retired: 100 |
| Chow-chow Group: Versatile | 77% | 7,870 | 109 Highest Retired: 113 |
| Clumber Spaniel Group: Spaniels/Flushers | 81% | 6,698 | 103 Highest Retired: 100 |
| Croatian Sheepdog Group: Drovers | 81% | 8,543 | 106 Highest Retired: 105 |
| Curly Coated Retriever Group: Retrievers | 76% | 7,172 | 100 Highest Retired: 99 |
| Czechoslovakian Wolfdog Group: Drovers | 80% | 16,088 | 101 Highest Retired: 101 |