Riley, a fifth-grader whose father is a former football star, is awful at sports. He wants to quit the baseball team, but his dad won't let him give up. So when one bad swing brings a three-legged dog into his life, Riley feels like he's been thrown a curveball. How can he take care of a dog and make his dad proud? Champ is a former champion show dog. But when an accident leaves him with three legs, this dog has to learn some new tricks. Can Champ show Riley that winning doesn't always mean coming in first? Together, Riley and Champ make a great team, but not everyone thinks so. Could they be separated?