Chuck was a small white Maltese dog.
According to Mondo, Chuck was a very smart and happy dog.
Chuck was owned by Mondo Owada. He brought in the newspaper every morning and afterwards begged Mondo to take him for a walk. Apparently, Mondo called him his "baby boy".
Chuck died when he was nine and years later Mondo still got very sad whenever he thought about him.
Chuck was very close with Mondo and Mondo called him his "baby boy". After Chuck died, Mondo missed him very much and got unusually emotional whenever he thought about him.
Chuck's relationship with Mondo's big brother, Daiya, is unknown.