Hanzou

Hanzou (ハンゾウ Hanzō) is a male Shiba Inu. He is a stray because his owner abandoned him, as seen in episode 8. Hanzou is a ninja dog. He has a mortal enemy from dark dog world named Sasuke who is also a ninja dog.

Appearance
He has brown and white fur. Inside of dog paradise, he wears what appears to be a grey-blue hakama, and outside of it he wears a jacket of the same color.

Seto
After he was abandoned, Hanzou went around picking fights with other strays, winning against crowds of dogs because of his ninja skills. He attempted to challenge Seto to a fight, only for Seto to surrender before the fight begun. Seto then took him to dog paradise to eat at a cheap Japanese open air restaurant, to which Hanzou commented that the loser ought to treat the winner to better food. Seto replied that any food is good as long as you're eating with friends, which moved Hanzou greatly. He is now highly loyal to Seto, and does much for him, as evidenced by the fact that he owns a gold card.