When his father left to fight against Akakabuto, Sabu 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. When Tommy decides to go get help from noble Ōu Army dogs, Sabu decides to follow him while Shin believes it's too dangerous. Sadly, Tommy and Sabu only managed to reach the neighbor territory as they were quickly found and killed by Muramasa's minions.
- Some fans believe Sabu Hidaka is of the breed Siberian Husky, but nothing is confirmed.