Nature

Dogs That Changed the World: Dogs By Design

Passport Season 25 Episode 12 | 52m 59s 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

Rating: NR

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Problems Playing Video? | Closed Captioning

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