| Breed | Active | Population | Highest Levelled |
|---|---|---|---|
| Cairn Terrier Group: Terriers | 77% | 5,558 | 107 Highest Retired: 105 |
| Canaan Dog Group: Drovers | 77% | 8,818 | 112 Highest Retired: 109 |
| Canadian Eskimo Dog Group: Draught | 77% | 11,599 | 111 Highest Retired: 109 |
| Cane Corso Group: Hunting | 76% | 12,598 | 103 Highest Retired: 98 |
| Cardigan Welsh Corgi Group: Drovers | 75% | 19,552 | 105 Highest Retired: 103 |
| Carolina Dog Group: Versatile | 77% | 7,828 | 93 Highest Retired: 94 |
| Carpathian Shepherd Group: Flock Guardians | 71% | 12,046 | 118 Highest Retired: 117 |
| Catahoula Leopard Dog Group: Drovers | 72% | 34,434 | 109 Highest Retired: 109 |
| Caucasian Ovtcharka Group: Flock Guardians | 76% | 20,045 | 106 Highest Retired: 112 |
| Cavalier King Charles Spaniel Group: Companions | 75% | 11,695 | 108 Highest Retired: 106 |
| Central Asian Shepherd Group: Flock Guardians | 70% | 32,776 | 106 Highest Retired: 107 |
| Chart Polski Group: Sight Hounds | 74% | 13,160 | 109 Highest Retired: 107 |
| Chesapeake Bay Retriever Group: Retrievers | 80% | 7,291 | 103 Highest Retired: 98 |
| Chihuahua Group: Companions | 73% | 25,289 | 108 Highest Retired: 110 |
| Chinese Crested Group: Companions | 76% | 13,559 | 102 Highest Retired: 101 |
| Chinese Shar-Pei Group: Versatile | 59% | 15,414 | 98 Highest Retired: 98 |
| Chinook Group: Draught | 75% | 11,567 | 99 Highest Retired: 100 |
| Chow-chow Group: Versatile | 76% | 7,917 | 109 Highest Retired: 113 |
| Clumber Spaniel Group: Spaniels/Flushers | 82% | 6,792 | 103 Highest Retired: 100 |
| Croatian Sheepdog Group: Drovers | 80% | 8,683 | 106 Highest Retired: 105 |
| Curly Coated Retriever Group: Retrievers | 77% | 7,201 | 100 Highest Retired: 99 |
| Czechoslovakian Wolfdog Group: Drovers | 79% | 16,340 | 101 Highest Retired: 101 |