In early 1861, as he prepared to leave his home in Springfield, Illinois, to move into the White House, Abraham Lincoln faced many momentous tasks, but none he dreaded more than telling his two youngest sons, Willie and Tad, that the family's beloved pet dog, Fido, would not be accompanying them to Washington. Lincoln was afraid the skittish dog couldn't endure the long rail journey, so he decided to leave the mutt behind with friends in Springfield...