Sorry I missed this thread before but some of these shots are just really great. Some seem a little dark to me but all in all pretty dang good. I agree with Antarctican that you really got the great expressions.
How are you lighting your white backgdrop? I have such a hard time getting my hi key white...well, white, without a lot of pp. Also, I'd like to see some full body shots and more multiple animals. Do you shoot in your studio for a living? Please post more!