Jumbo is one of Yamato's closest friends.
Jumbo is an English Bulldog. His fur is white with red markings and darker markings around the muzzle. He wears a black eye patch over his right eye and wears a red collar with spikes on it. He has yellow eyes and cropped or torn ears. He also has scars on his body.
He is brave, fearless and strong.
Shiroi Senshi Yamato
When the match between Yamato and Big Hunter went crazy and began to make attacks people's throats. Jumbo attacked the Big Hunter, and saved the day. He and his owner spent the night at Ryo's house then they received a letter from someone challenging him to a fight and he agrees. Jumbo at first mistaken Yamato for a female dog.
Jumbo together with his owner Kosuke takes part in the battle against Shishiryuu and his owner who bears a grudge.
Jumbo lost his left rear leg, his left eye, and both of his ears trying to defend Ryō from Black Satan, and Kosuke would have been willing to put Jumbo down, if it meant being alive would make him suffer.