Nature

Dogs That Changed the World: Dogs By Design

Season 25 Episode 12 | 52m 58s | Video has closed captioning.

The second hour of "Dogs That Changed the World" details the explosion of the basic working dog types into the roughly 400 breeds known today; explores concerns about today’s competitive breeding and its effect on dogs’ health and well-being; and outlines dogs’ potential role in medical care for human beings.

Aired: 04/29/07

Expires: 01/31/22

Rating: NR

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Problems Playing Video? | Closed Captioning

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