Okay, so, the dog has the same seiyuu as Watanuki, from xxxholic, of course, that doesn't mean they're related....but what the dog said this episode make me think they are the same person-eh, character. And knowing Clamp, they seem to like this kind of thing, relating a character from another series to another.
The dog, is a shop own who grants people wishes. So, it could be that someone came to the dog and grant a wish where saya now has this current memory. Saya said she never left this city, therefore it must not be her. However, in order to grant a wish, scarifice is needed. Which can explain why shes so confuse with everything.
And that shop....the lady did leave the shop to watanuki, so....it'd make sense that it is him. But why is he a dog lol. Also, another thing that I find werid. Nene and Nono already told Saya that Guimauve feels like kiss, yet, she was wonder what they are similar to. Did her memory get modified or?
Also, did saya really had a mother? Or at least who fought with the furukimono. And Tokizane....he has this interest in saya...perhaps he's invovled in this whole situation as well?
Finally, does Saya know that she has certain power? Like how her eyes turn red....she sounded very shocked when she saw her reflection in the blood.
On a side note, the tube of blood....the guy says something about experiment... Could it be between Kanako and fumiko?...........Maybe they are related.