I'm gonna have to. Billy and Mirah are both british red spotted shorthairs, and I don't wanna have to check to see genders just to tell who's who, and CJ and Annie are both Odd Eyed White American Shorthairs, and I don't wanna have to call kitty kitty just to see who comes to me. (Annie's deaf) So, when the kits get older, they are all getting new collars... perhaps ones that have my name and number engraved in them... with no metal things that they can get caught on like CJ did. That's why I took them off to begin with.