Rockruff is quadrupedal Pokémon resembling a dog. It has a light brown coat with its paws, snout and tips of its ears being dark brown. It has a fluffy white tail that curls up tightly. Around its neck is a gray-white collar of fur that is lined with dark brown rocks.It also has blue eyes.
It has an incredible sense of smell, never forgetting an odor it smells. There are tales of Rockruff reuniting with trainers after days of separation using the faintest of smells. Rockruff stands brave and persistent in battle. It's so persistent that it keeps going in battle until it outlasts the opponent even stronger ones. It is a very social Pokémon, but it grows wilder as its grows. if it howls when the sun goes down, it is close to evolving and it leaves before it evolves and then, returns after evolves.