Lucario is a canid-like Pokémon that is a bipedal digitigrade with finger-like digits on its forepaws. Its chest and the exterior of its wrists each feature a single, white spike. It also has a large snout and ears, red irises with vertical slit pupils, an "hourglass"-shaped figure with leering thighs significantly thicker than the rest of its body, iron rings incorporated into its shoulders and waist, and a raccoon's "mask" that loosely resembles a khakkhara with four small dreadlock-like appendages on the back of its head that are used to sense Aura. The coloration of Lucario's fur is predominantly blue and black, although its torso features buff-colored fur slightly shaggier than the rest of its body. When it opens its mouth wide enough, sharp fangs can be seen.