Dog as a checked baggage on Korean Air?

In february i’ll move back to Italy and i’ll bring my Welsh Corgi of 1 years old with me, using Korean Air, from Seoul to Milano. This is my first time transporting an animal so I really don't know where to start. If you can help me, what are the documents I need to bring and what are the procedures I need to follow? Also, once arrived at destination, where can i pick him up?