Based on the star's famous love of animals, this musical comedy portrays Billy setting out to add a sheepdog to his vast entourage of animals and coming back with an irresistible horse named Armitage instead. To his manager's horror, Billy smuggles the horse backstage during rehearsals for his big show and the horse proceeds to create havoc. Little do either of them know that Armitage is actually a thoroughbred racehorse. Then Billy's horse contracts pneumonia and Billy must choose between love of his horse and the big show.