“Dogs have more genetic diseases than any other species on the planet.” David Ishee told me this early in our conversation. His claim makes sense: there’s no other animal that humans have purposefully bred with an emphasis on form over function—aesthetics over health—for so long. Centuries of inbreeding have left many dog breeds with a severely limited gene pool, and this lack of genetic diversity is to blame for disorders like brachycephaly in bulldogs, hyperuricemia in dalmations, and cardiomyopathy in boxers.
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