When I had a crestie she was absolutely insane and kind of cranky. By insane I mean that her favorite thing to do was jump and run as fast as she could. She was not laid back at all. She was also very nippy and moody, so I didn't handle her a lot. I'm not saying that this is the standard for cresties, but this is the best way to describe them, IMO (as stated by a friend of mine who breeds them): They are sweet and sour.