Mamenosuke is a Shiba Inu dog who appears as a supporting character in the anime Mameneko. He was originally owned by another person, but after that owner died, he was adopted by Megane, the older brother of the household where the cats Azuki and Daizu live. Because Mamenosuke was raised among cats from a young age, he grew up believing that he himself is a cat. This mistaken identity shapes much of his behavior and interactions, as he acts more like a feline than a canine. He often uses a shinobi‑like accent when vocalizing, adding a distinctive quirk to his character.

His personality is gentle and somewhat oblivious to his true nature, which leads to gentle comedic moments as he tries to fit in with the cats. He is not aggressive or loud like a typical dog; instead, he is calm and agreeable, adopting cat‑like mannerisms such as grooming himself or curling up in sunbeams. His primary motivation appears to be a desire for belonging and companionship, which he finds within the family despite his unusual self‑perception. He does not exhibit any conflict with the cats; rather, he is accepted as part of the household.

In the story, Mamenosuke shares a close bond with Megane, who took him in, and he interacts peacefully with Azuki, Daizu, and the other family members. He does not serve a major plot driver but instead contributes to the slice‑of‑life atmosphere by adding an extra layer of gentle humor and warm domesticity. Over the course of the series, he remains consistently cat‑minded, though at some point he leaves the household and moves to another location, implying that his journey continues beyond the main setting. His notable ability is his capacity to mimic cat behavior so convincingly that he even fools other animals, demonstrating how deeply his upbringing has shaped his identity.