Billy needs some companionship, and he decided to adopt a dog to make his life richer and happier. What he gets when he lets big, shaggy stray Bear into his life is something completely unexpected. Bear is a wonderful companion, but he's even better in his man-form. When Billy finds out it’s the moon that brings out the beast in Bear, he finds a solution that works for both of them. With a series of vicious dog attacks creating panic all over the city, though, Billy has to wonder if Bear has even more secrets he doesn't know about. Can they figure out what's going on before Billy loses all trust in man's best friend?