Ruffnpuff and its evolution are themed after Wild Boars, the Pokémon itself is the juvenile of the two. Ruffnpuff has a fairly simplistic body with large fluffy fur covering much of its body, its fur is a very faded shade of brown that appears like black, it has a secondary colour of a faded maroon colour that is prevalent on the Pokémon's head, ears and around its hands and feet. The Pokémon has a short tail that curves at its tip although is mostly straight. The fur around the main part of its body is quite fluffy and appears similar to sheep's wool. The Pokémon has short limbs that appear to be engulfed by its fur, it has sharp claw-like hooves with three distinct points on each hoof.
The Pokémon's face has a short snout and has two small canines protruding upwards from its lower jaw, on the males these teeth are slightly larger. The Pokémon has a constant angry expression and is known to have a temper, charging at anything it can fight, it has black fur around the top of its eyes that gives its angered expression more of a constant appearance. The Pokémon's ears are fairly large and diamond shaped although rounded as well.