Anna is spending summer vacation on her grandparents' canal boat with her new puppy, Fred. They both love the boat, but Anna's grandparents have a Labrador named Sunny, and he's very grumpy with Fred. The two aren't getting along at all, so Anna's grandparents decide that Fred should go home. But by the time Anna's parents come to pick him up, Fred has run away to hide in the woods. With the boat moving on that evening, will Anna be forced to leave Fred behind?