Ref is a dog from Namonaki Inu No Uta.
He met the German Shepherd John with Hidetoshi Sekiguchi when they were in Africa. One day a lion tries to attack Ref, but John and Hideoshi stop him and decide to keep the dog and take him to Japan. After this, Ref decides to follow John for the battle against Akakabuto. Meanwhile during the battle, one of Akakabuto's minions tries to attack John, but Ref defends him and jumps on the way. Ref receives a hit and dies saving John's life.
- Some fans believe Ref is an Akita or any other of the Nihon Ken/Dog of Japan, but nothing is confirmed.
- Ref can come from reflex camera or reflector. Or his name can be Lev, meaning lion in Russian.