In the era of "friending," stories of true friendship are more riveting than ever. Susan Orlean, author of "The Orchid Thief," tells a classic story of friendship between a man and his dog in "Rin Tin Tin: The Life and the Legend." As a puppy, the world's first celebrity dog was abandoned on a World War I battlefield and rescued by an American doughboy named Lee Duncan. It's a classically American story of determination, ambition and dedication, but most of all it's a heck of a buddy story: A man and his dog rise from the trenches of war to the heights of fame in golden-era Hollywood, relying on each other to get through all the muck in between. Here, Orlean shares some of her other favorite stories of friendship.