Pure Inbreds

James Serpell wants to expand the gene pool for purebred dogs:

Nowadays, many breeds are highly inbred and express an extraordinary variety of genetic defects as a consequence: defects ranging from anatomical problems, like hip dysplasia, that cause chronic suffering, to impaired immune function and loss of resistance to fatal diseases like cancer. The only sensible way out of this genetic dead-end is through selective out-crossing with dogs from other breeds, but this is considered anathema by most breeders since it would inevitably affect the genetic “purity” of their breeds.