The Smartest Dog in the World

http://www.cbsnews.com/news/smart-dog-anderson-cooper-60-minutes/

Human beings have lived with dogs for thousands of years. You'd think that after all that time we'd have discovered all there is to know about them. But, as we first reported last fall, it turns out that until recently scientists didn't pay much attention to dogs. Dolphins have been studied for decades, apes and chimps as well, but dogs, with whom we share our lives, were never thought to be worthy of serious study. As a result, we know very little about what actually goes on inside dogs' brains. Do they really love us, or are dogs just licking us so they can get fed? How much of our language can they understand? Before you answer, we want you to meet Chaser, who's been called "the smartest dog in the world."

Eighty-six-year-old retired psychology professor John Pilley and his border collie Chaser are inseparable.