Breedslate.com had an interesting little article on dog breeding - here's an excerpt...
In the course of engineering dogs to look, feel, and act as we wanted, we ruined millions of them. We gave them legs so short they couldn't run, noses so flat they couldn't breathe, tempers so hostile they couldn't function in society. Even our best intentions backfired. Nature invented sexual reproduction to diversify gene pools and dilute bad variants. By forcing dogs into incest (which we ban among humans, in part for biological reasons), we defied nature. We concentrated each bad gene in a breed, magnifying its damage: epilepsy for springer spaniels, diabetes for Samoyeds, bone cancer for Rottweilers. That's why the dog genome is so nifty: We can find disease genes just by comparing one breed's DNA to another's.

2 comments:
That's why my dogs are mutts.
Left out of the quoted portion of the article were the links to previous Slate stories about dog-lovin' and dog-eatin'.
Yep.
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