Rolf is a dog that appears in The Minish Cap. Rolf's owner is Romio, a man who lives in Hyrule Town. Rolf dislikes cats, and doesn't get along with Julietta's cat Scratcher very well, and they are constantly bickering. Due to this feud between the two, Julietta and Romio cannot get married.
When Link tries to speak with Rolf, the dog will simply bark at him. However, when Link is in Minish form, Rolf will actually talk to Link, warning him that he needs to be careful walking around as he is so tiny.
Link is able to fuse Green Kinstones at various points in the game with Rolf. As it is a Green Kinstone fusion, it is not set to a specific treasure chest, but instead, one of the many possible treasure chests. There is one random Red Kinstone within the game that opens up a location in the Hyrule Castle Garden leading to a Piece of Heart, as well as a random Blue Kinstone that opens up a tree in North Hyrule Field leading to a Fairy Fountain. Rolf is one of the many characters in which Link can make this Kinstone fusion with.