EclecticWingtips: She can be purebred. The female my folks had was a papered purebred, looked just like that one. And sweet as could be. I've found that the deer headed Chis seem to be more snuggly.
That black one has a deer-head shape. The rest are apple-headed, though the one in the center looks almost a combination of the two types of heads. Or it could be the angle of the shot.