Henry wants a dog more than anything in the world'more than a cowboy costume, even more than an all-expenses-paid trip to the moon. So he puts an ad in the newspaper to find the perfect pet. Far away, a lonely duck who desperately wants a friend reads the ad. He has the clever idea to disguise himself as a dog and apply for the job of Henry's best friend. But his cover is quickly blown when he isn't very good at catching balls and his floppy ears...