""He's a porker with passion, ""a dancing fool, a pig with rhythm- ""this breaks every rule,"""said the normally reticent mule." Now in paperback, "Dumpy La Rue," a story of a pig who knew what he wanted to do. Elizabeth Winthrop's romping, rhyming story and Betsy Lewin's exuberant illustrations will have readers tapping their toes, jumping for joy, and dancing a jig with this passionate pig as they follow him and the barnyard animals from farm to fame.