When his father left to fight against Akakabuto, Tommy and his brothers stayed to watch over the pack and the territory. Unfortunately, the nasty dog called Muramasa took over the pack and the leadership by using their mother as hostage. Muramasa started to rule with harsh and cruel way. Tommy decides to go get help from noble Ōu Army dogs. Shin warned him that Muramasa would track him down and kill him but Tommy wasn't afraid to die. Sabu decided to follow Tommy as well. Unfortunately, Tommy and Sabu only managed to reach the neighbor territory as they were quickly found and killed by Muramasa's minions. Tommy's body was found by Zack and his pack members. Later, Tommy is buried by Shin who mourns his death and feels guilty because he didn't try to help his brothers when he had a chance.
- Some fans believe Tommy Hidaka is of the breed Siberian Husky, but nothing is confirmed.