Wilby Daniels (Tommy Kirk) finds a mysterious ancient ring and unintentionally turns himself into a huge sheepdog -- with his human voice intact! Wilby's kid brother thinks it's a riot, his neighbors are amazed and the local police are flummoxed. Wilby likes the brunette beauty (Annette Funicello) on his street, but keeps turning into a dog at the worst times. To become a human again, Wilby will have to thwart a group of spies in his neighborhood.