He is black and white Siberian Husky/Alaskan Malamute mix.
Ginga Densetsu Weed
Shinsaku and all the Mutsu brothers are sent to Hokkaidō with the Ōu soldiers to help Hakurō and his pack who were getting invaded by the Russian Army dogs. Some of his brothers were killed in battle. Hakurō has sent his son Suzaku to ask them to help battle Viktor received. He leaves his brothers to help Hakurō's packs.
- This character is called Shinsaku in the GDW anime, however there already is another Shinsaku in GDW manga. He is Kisaragi's son, too, but they're two different characters.
- This character's actual name is currently unknown as it hasn't been mentioned.
- He is no longer present in Ginga Densetsu WEED: Orion or Ginga: The Last Wars.