The story of a polo pony's upbringing in California becomes ridiculous as it attributes a human intelligence to the horses and takes the characters both human and equine, through a hackneyed plot in stilted, wooden dialogue. At the Jackson's stables, the Mutt doesn't seem to be very promising. But training proves otherwise and the pony is sold and taken to Argentina where he helps win a championship for the U.S. Though the Mutt is injured, he gets his reward when the Jacksons buy him back and put him to pasture with his mother, Trite. The drawings by Richard F. Ward are far better than the story.