TABLE 1.
Breeds included in the study, with pedigree size and the numbers of sires, dams, and founders
| Breed | Breed group | No. dogs | No. sires (% of males) | No. dams (% of females) | No. founders |
|---|---|---|---|---|---|
| Akita Inu | Oriental | 21,155 | 1,329 (13) | 2,115 (20) | 223 |
| Boxer | Mastiff | 195,358 | 8,518 (9) | 24,601 (25) | 4,032 |
| English bulldog | Mastiff | 46,420 | 2,175 (11) | 7,660 (36) | 882 |
| Chow chow | Oriental | 18,386 | 928 (11) | 2,597 (27) | 1,012 |
| Rough collie | Shepherd | 83,864 | 4,190 (11) | 13,232 (30) | 5,285 |
| Golden retriever | Hunting | 317,527 | 7,752 (5) | 28,963 (18) | 6,932 |
| Greyhound | Shepherd | 1,060 | 103 (21) | 159 (28) | 81 |
| German shepherd dog | Shepherd | 474,078 | 21,629 (9) | 48,108 (20) | 15,843 |
| Labrador retriever | Hunting | 703,566 | 26,830 (8) | 70,541 (20) | 15,064 |
| English springer spaniel | Hunting | 276,179 | 17,471 (13) | 34,252 (24) | 9,718 |
The breed group refers to the four groups identified by Parker et al. (2004).