A quick trawl through the internet find quite literally hundreds of these pictures. Clearly some people have the sort of relationship with their cats that allow them to see the inner feline thespian. On the other hand maybe they just have too much time.
I wonder if the producers could be missing a major opportunity here by limiting themselves to a purely human cast. How different would the output have looked if that first film had been produced by Jim Henson instead George Lucas?
Just writing this I have noticed that I had a "Label" for Cats but not "Films" I think that tells you a lot about me, I have now changed that!