TABLE 1

Breeds included in the study, with pedigree size and the numbers of sires, dams, and founders

BreedBreed groupNo. dogsNo. sires (% of males)No. dams (% of females)No. founders
Akita InuOriental21,1551,329 (13)2,115 (20)223
BoxerMastiff195,3588,518 (9)24,601 (25)4,032
English bulldogMastiff46,4202,175 (11)7,660 (36)882
Chow chowOriental18,386928 (11)2,597 (27)1,012
Rough collieShepherd83,8644,190 (11)13,232 (30)5,285
Golden retrieverHunting317,5277,752 (5)28,963 (18)6,932
GreyhoundShepherd1,060103 (21)159 (28)81
German shepherd dogShepherd474,07821,629 (9)48,108 (20)15,843
Labrador retrieverHunting703,56626,830 (8)70,541 (20)15,064
English springer spanielHunting276,17917,471 (13)34,252 (24)9,718
  • The breed group refers to the four groups identified by Parker et al. (2004).