Dog

He is very level-headed and mature and takes matters seriously. He appears to care for and like Saya.

He is a small dog with brown fur and 3 red markings on his forehead and eyes.

When he first appears in the anime, he is silent and distant. However, as the story progresses and Saya starts to recover more of her memory, he starts to talk to her. He tells her that his mission is to fulfill someone's wish. That involves helping her regain her memories and "waking her up." When Saya asks who's wish it was, he says that information cannot be released as it would violate the contract. In the last episode of Blood C, it is assumed that Saya's past-self, before Fumihito drugged her, was the one that had made the wish.

Blood-C: The Last Dark

He appears again when Saya visits a certain shop owner who can grant wishes (the same one from XXXHolic). He is revealed to just be a vessel for Watanuki to communicate with Saya.