Sasori: "He's so cute. Can we keep him that way? please Sataru, can we? He can't talk can he?"
Zylar pup: "what!?
Why the hell did you make me into a dog? Change me back right now! I'm already getting the urge to sniff someones butt! That may be your past time Sataru, but not mine."
Sataru can change people into animals if he so chooses with demon magic. He doesn't like too though. he finds it useless and inneffective unless it's to stop Zylar from strangling Sasori.