He is Kai Ken belonging to the Kurohabaki Clan.
Ginga: The Last Wars
After six months, he leaves Yamabiko and with Amon at Akame mountain to meet with Orion.
Yamabiko return Shikoku, but starts moving again with his flock, after Ōhu that attacked Monsoon. Orion and Yamabiko forces combine and arrive at Nagano Unsai up. United Army dog then leaves towards the Ohu.
Yamabiko's group and Sasuke curse the bad weather, with Yamabiko saying a pet dog like Sasuke isn't used to getting so wet. Sasuke jokes he likes being wild and the group hear that Orion has returned.
Sometime later, a flood causes a wounded Ken to be washed into a river and the Ou army go to the location to find and save him. They each keep a watchful eye on the raging river, as Kawasemi dives in to find him.
After Ken is saved, he heads with the others to find Monsoon and begin the attack.
He bite Monsoon's paws and tell pet dog to let go. He received injuries and had to leave the line of battle.
Gallery
See more pictures in Yamabiko's Subordinate (Photo Gallery)