Another tidbit from The Straght Dope, and one which made four people at dinner the other day say "Noooo!" in that way that means Really!?:
Cats can be, very clearly, left-handed. So watch your kitty and see which paw they use most. All three of mine are righties so far, but if you're a lefty your pet may be right there with you. Read the snappy proof here.