Byakuren no Fang

A boy named Makoto aspires to become a Tosa dog fighting trainer. His father, a sumo wrestler named Rouou, gives him a brown puppy, which Makoto assumes is a Tosa. He is surprised to learn the dog is actually a Siberian Wolf. Despite this, he trains it as a fighting dog, naming it Zero. Unbeknownst to Makoto, Zero’s mother was killed by a Tosa named Unryū, owned by a fighter named Anzai. This event occurred in front of Zero. Makoto enters dog fighting competitions with the goal of avenging Zero’s mother by confronting Unryū.