The rat appears in the depth-psychology corpus as a figure of remarkable ambivalence, simultaneously reviled and revelatory. Hillman’s archetypal readings in Animal Presences constitute the most sustained engagement, treating the rat as an emblem of underground intelligence, obsessive tenacity, and labyrinthine knowledge — the creature that carries Ganesha and opens passages, that navigates the city’s hidden infrastructure and surfaces in dreams as the guide one dare not reject. At the neurobiological pole, Panksepp deploys the rat as the primary model organism for investigating play, fear, and social bonding, making it the empirical substrate upon which affective neuroscience constructs its claims about basic emotional systems. Alexander’s Rat Park experiments intervene decisively in addiction theory, demonstrating that environmental impoverishment rather than pharmacological compulsion drives morphine consumption — the rat as instrument for dismantling reductive drug determinism. Berry’s dream analysis deploys the rat as an image whose significance within a dream is determined by its relational position, not by inherent hierarchy. Watson’s conditioning experiments with Little Albert and Skinner box studies invoke the rat as the canonical laboratory subject of behaviorist psychology. Across these registers — archetypal, neuroscientific, ethological, and behaviorist — the rat reveals fundamental tensions between shadow and instinct, isolation and sociality, compulsion and freedom.