Apparently, cats have a dominant front paw. You can check your cats by putting a treat in the bottom of a glass. Which paw does your cat use to fish it out? You may need to do this several times to make sure, like mugumogu did with Maru and Hana.
So Hana is left-handed, while Maru is right-handed, after first trying it with his face. According to RocketNews24, 40% of cats are left-handed, 50% are right-handed, and 10% are ambidextrous. BRB going to find glasses and treats for four cats. -via Fark