Kobushimaru is a fighting dog owned by Jin Itagaki.
He's the father of Ranmaru
He was the first opponent that had a draw with Unryū. Later on he sired four pups, the runt was named Ranmaru who he got a close bond with. But as his pup was few months old he was given to a new owner, and he himself was set up with a rematch with Unryū. When he arrived for it he attacked his own son to awake his spirit. He lost the fight against Unryū, and decided to train his son. He whined till the humans put Ranmaru in his cage. When the peopl had left for the night, he began train and fought his son. In the end he let Ranmaru kill him during the second night.