Shinsaku is a black-and-white Siberian Husky.
He has a mainly white face but black circles around his eyes, similar to a panda.
Ginga Densetsu Weed
Shinsaku lives with his brothers and father in Mutsu.
He and his brothers fight Genba's minions who try to steal females and come in time to rescue Chiko in time with Shigure and Akame. He and his brothers later fight Genba's platoon and in commando to slay Hōgen.
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 Shinsaku's brothers were killed in battle.
Ginga Densetsu Weed: Orion
After the volcano explosion in Ōu, Shinsaku and his brothers found Weed's daughter Bellatrix, who was lost in the snow storm. While Izō looked after Bellatrix, Shinsaku and the rest of his brothers tried to find something to help Bellatrix. Their search was interrupted because a Kurohabaki clan member attacked Izō and kidnapped Bellatrix. Luckily, they manage to stop him, but a second dog appears and rekidnaps the young Akita mix. While four of their brothers pursued the second kidnapper, Shinsaku and his two brothers Saburō and Izō, killed the evil dog.
Soon after, they get into a short fight with Masashige and his pack. During the fight, Izō lets loose a howl to cause an avalanche. Shinsaku and the others jump into the snow to avoid damage, however, Shinsaku was crushed by the snow along with Kazuki.
- In the GDW anime, there is another Shinsaku which is a different character. This character also appears in the manga, but his name is unknown there.
- He and his brothers are called Alaskan Malamutes several times in Ginga Densetsu Weed, despite the fact that their father was mentioned to be a Siberian Husky.