Eiji, a German Shepherd with a background in law enforcement, began his journey at Happy Kennel before honing his expertise as a police scent-detection canine. He operates as a dedicated working partner, often seen accompanying Cammy, a Cavalier King Charles Spaniel, during their travels. His professional history emphasizes precision in tracking and detection, though the intricacies of his training or past missions remain unspecified. Interactions with fellow dogs like Cammy highlight a collaborative partnership, relying on teamwork during shared tasks. His personal demeanor and narrative progression are conveyed through these cooperative engagements rather than explicit exploration.