From 2014, Anderson Cooper's report on Chaser, a dog that could seemingly identify the names of over a thousand different toys. And from November of last year, Cooper's story on how dogs may have evolved to be friendlier, and his look at how trial cancer treatments for dogs could also lead to breakthroughs for humans.

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0:00 Introduction
0:11 The Smartest Dog in the World
12:58 Survival of the Friendliest
25:58 Comparative Oncology