A smart girl named Annie, living in the town of Upson Downs, meets a stray mutt. The animal turns out to be very smart and nice, so the two quickly become friends. Unfortunately, due to the actions of a greedy landowner, Annie's family farm is threatened by drought and the girl must quickly come up with a way to save her home. Seeing the agility and dizzying speeds achieved by her newfound four-legged friend, she comes up with the idea of ​​competing for the main prize at the championship organized as part of the dog show in London. To do this, the fast, although slightly shy dog ​​will have to defeat his purebred competitors and their dishonest owners on an obstacle course.