Roverandom was published posthumously in 1998 after being edited by Christopher Tolkien.
Tolkien wrote Roverandom in 1925 after his young son Michael lost a toy dog on a beach. The story follows a toy dog named Rover who is transformed and has adventures involving the Moon, the sea, and a wizard.
Christopher Tolkien edited the surviving manuscript for publication, and George Allen & Unwin released the book in 1998. It is a shorter children's fantasy rather than a Middle-earth narrative, so it is distinct from Tolkien's major legendarium publications.
Roverandom is often confused with Tolkien's other posthumous books because Christopher Tolkien edited many of his father's papers. Unfinished Tales appeared in 1980, while The Children of Húrin was published in 2007. Roverandom's origin as a response to a lost toy gives it an unusually personal beginning.