Probably a mix/mutt--not a Rex as the whiskers are full sized--looks a lot like our boy Noodle--listed as a mix by the Animal Foundation. Healthy and happy is all we care about. Adopted an English Spot mix once and she was supposed to be full grown at a skinny 7 pounds--10 months later she was 20 pounds and turned out to be a pure Checkered Giant--too bad my chrystal ball was in the "shop".