Source
63
69
73
The story begins in Futago Pass, a paradise for dogs where peace reigned thanks to the Ouu Army's exploits. Orion, the pup of Ouu Army Commander Weed, spent peaceful days with his newborn siblings: his older brother Sirius, younger brother Rigel, and younger sister Bella. But fate would not grant Orion tranquility. Suddenly, a natural disaster struck the mountains of Ouu, shattering the paradise. Orion and his siblings were scattered far and wide! (Source: Nihon Bungeisha, translated)
Spin-off
A giant demon bear named Akakabuto has taken over Futago pass. Shortly after, a silver, tiger-striped Akita pup named Gin is born and is trained as a bear-dog. Gin is brought to Riki (the leader of a large pack of dogs and Gin's father) to join the pack. Riki let's him join after proving his strenght and sends his platoons to all parts of Japan to recruit strong males to fight Akakabuto. Gin, the third generation of bear-dogs goes through many hardships for the purpose of stopping the terrifying bear, Akakabuto. (Source: Anime News Network) *Note: Chapter count reflects the original serialization in Weekly Shounen Jump. The chapters were later combined into 55 chapters for the tankōbon release.*