S25 E12: Dogs That Changed the World: Dogs By Design

Aired: 4/29/2007 | 0:52:59 | Episode
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.