Otis and the Puppy by Loren Long

Otis is a special tractor. He and his farm friends love to play hide-and-seek. Otis especially loves to be "it", finding his friends as they hide in funny places. But one day, when the newest addition to the farm - a bounding puppy who can't sit still - goes hiding, his attention wanders along with his legs and soon he is lost in the forest. Daylight fades quickly and Otis begins to worry. He knows that his new friend is afraid of the dark, and must be terrified to be all alone in the woods. But Otis has a secret that makes his tires tremble at the thought of searching in the dark. How can he conquer his fear to save the day?