Inukashi, otherwise known as Dogkeeper, is one of the denizens who live outside No.6. Raised by a dog, they now run a hotel where they rent out dogs to the tenants, allowing them to keep warm in the winter. They also engage in an information trade. They have a strong bond with dogs, particularly the dog that was their mother, going as far as to try to kill anyone who would insult her memory.

Though their relation with Nezumi is antagonistic on the surface, the two have come a little closer since Shion has appeared.

Inukashi's gender is kept ambiguous throughout the series.