Swinub is a tiny Pokémon with a pig like nose. It is tan with brown stripes running down it's fur. Swinub has feet, but its fur hides them completely. Swinub are known for scurrying across the ground, and bumping into things accidentally.
In the anime, Dawn acquires a Swinub she met in Mr. Backlot's garden, after it saved her and the group's Pokémon from Team Rocket. This Swinub eventually evolved into a Piloswine and then into a Mamoswine two episodes later. Now at this stage, it has acquired gigantic strength, but has also become very aggressive towards Dawn and her Pokémon. Dawn is still eager to train it, however. As revealed in the Pokémon Anime, Swinub has an enormous appetite.
As seen in Hot Springing a Leak, Swinub are able to smell out hot water straight from the source.
This, however, is canon only for the anime, and might not be faithful to the games.