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The selective breeding that created the hundreds of modern dog breeds has put purebred dogs at risk for a large number of health problems, affecting both body and behavior.
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In this Web exclusive video, producer and director Corinna Faith discusses the making of "Dogs That Changed the World."
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Genetics and brain physiology can affect a dog's personality and behavior.
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The two-part special "Dogs That Changed the World" tells the epic story of the wolf's evolution, how "man's best friend" changed human society and how we in turn have radically transformed dogs.
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Scientists continue to debate when, where, and why dogs evolved from wolves, but they are clear on one issue: the physical alterations that mark the transformation.
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Discover ancient dog breeds from around the world on our Interactive Map.
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"Underdogs" tells the poignant story of two misfit dogs whose lives were turned around by people who saw their potential for greatness.
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Lessons in the guide use the programs as a starting point for discussions about the domestication of dogs, selective breeding, and the ways in which humans and dogs work and live together.
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The behavior of dogs is shaped in part by instinct that is selectively bred. View photos of popular dog breeds and learn about their hard-wired behaviors.
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