National Geographic : 2012 Feb
Along with the patchwork of breeds pictured on the previous pages, Manny, an Afghan hound (right), and Razbery, an English setter (left), represent the best of the best: entrants in the Westminster Kennel Club s 135th annual dog show. The centuries of breeding that produced such striking diversity also created isolated genetic populations that are helping scientists understand human diseases. We re the people doing the genet- ics, says one researcher. But breeders have done all the eldwork.