Saru

Saruu is the pet dog of two of the World Nobles, Saint Roswald and Saint Shalulia. This dog, like all other Nobles, wears a helmet to "protect" him from the outside air. When we first see him, he's urinating on Devil Dias, a slave to his owner's. He has the appearance and color of the toy dog breed Pug, however his legs and body are longer than normal.

Trivia
Saruu is currently the only World Noble that is an animal.