Chamaru

is a ninken from Konohagakure's Inuzuka clan and Akita Inuzuka's partner.

Background
At some point in time, Chamaru lost his right hind leg which Katasuke Tōno replaced with a prosthetic, leading his partner, Akita, to join the village’s Scientific Ninja Weapons Team.

Personality
According to Akita, Chamaru is a very dutiful dog and became saddened when his lost leg robbed him of the ability to continue being a ninken. Chamaru is also well-acquainted with Boruto Uzumaki.

Appearance
Chamaru is a medium-sized, light-coloured dog with a very bushy tail. His right hind leg has been replaced with a prosthetic one.

Ao Arc
When Boruto and his team helped escort Katasuke to the lab, the Chamaru quickly recognised Boruto's sent and greeted him. While happy to see his old friend, Boruto was surprised to see Chamaru's prosthetic leg. It was from the explanation of what Katsuke did for Chamaru that Boruto was able to finally get over his anger at both Katasuke and advanced ninja tech.