). In just the past century, many of them have undergone major transformations.
Entertaining as it is to compare our favorite dogs to their ancestors, their pedigrees often come with a cost. Because many breeds descend from just a few individuals, they lack genetic diversity, which predisposes them to a host of diseases that mixed breeds escape. In some cases, those diseases directly result from the anatomy dog fanciers have sculpted in their pursuit of each breed’s ideal .
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