Wilson is Rough Collie who used to be used as a circus dog on Shikokou island. In his past, Kurojaki the (leader of the Koga dogs) killed a few members of Wilson's family. In vengence, Wilson captured Kurojaki's son and threatened to throw him off of a cliff. The pup falls because Wilson get's pushed but Cross saves the puppy. Wilson later joins the pack of Ou and shows them the way to Shikoku. He tells them there are valuable fighting dogs on the island. Thanks to Wilson,s knowledge and connections the Ou pack gains Musashi and Benizakura as allies. The two Tosas are some of the strongest dogs in the world!

With information derived from the manga it shows that Kurojaki was taken in by Wilson's owner to be used as a circus dog. Kurojaki became angry and killed Wilson's on Londo and kidnapped Wilson's wife, Lean. She was killed and eaten by the cannibal Koga dogs.

Wilson play a minor role in Ginga Densetsu Weed manga. He was meant to appear in the anime, but he was cut out. His character model (collie) can be seen among dogs in Weed's group for several episodes.