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Artu is a tan, Croatian bloodhound (a mix between a Tyrolean bloodhound and an Italian bloodhound). He is tall and slender, and wears a dark red collar with silver studs.
In World of Winx, he retains his coat patterns but his collar is changed to a red collar and has the letter "A" on a silver, square tag.
His first appearance was in "The Last Fairy on Earth", along with his owner, Roxy, the fairy of animals. He was part of the event that helped Roxy obtain her power. Gantlos had severely injured him, which infuriated Roxy, causing something to trigger inside Roxy, causing her to transform. She later used her powers to heal him.
World of Winx
Artu, known as Arthur in this series, has only been seen in one episode: "The Shaman". Artu uses his magical link with Roxy to alert her that the detectives, Evans and Gómez, have just exited their car and heading inside the Frutti Music Bar. Roxy herself, then alerts Bloom of the detectives. Aware that the detectives could put themselves in danger should they continue following Bloom, Roxy has Artu steal the detectives' car keys to keep them distracted for Bloom. The girls laugh as they watch the detectives give chase to try and get their keys back.
- Artu is the abbreviation of the name "Artùro", which is the Italian version of the name Arthur, perhaps as a reference to the Arthurian Legend, as references to the legend of King Arthur have been made many times in Season 4.
- In the DuArt dub, his name has been changed to "Arthur".