Houndour is a dog-like Pokémon with short, black fur. It has a red underbelly and snout. Houndour has short, pointed ears and a tail. Houndour's fangs protrude out of its mouth, and its nose is dark in coloration. There are white bands on Houndour's ankles, and more rib-like ones on its back. Houndour appears to have a simplistic, stylized skull on its forehead, with the orbits looking much like 'eyebrow' patterning commonly seen on dogs. Houndour also has circular, red-colored patterning on the underside of its paws.