Kuma is a juvenile bullmastiff, born to be a show dog, but a deformed ear sees him dumped in the street. He becomes homeless, a scavenger in an unfriendly world, where loyalty to a friend is the key to survival.

Kuma is kind hearted and wants people to like him, but his size and strength has him treated as dangerous. He wanders into a country town where a price is put on his head. People think he is the leader of a pack of dogs that are attacking the sheep. Kuma hides in the town's rubbish dump and meets a stray cat called Kitty.

Kuma and Kitty form an unbreakable friendship, and the story tells how they save the sheep despite being the ones who are being hunted.