Cats are certainly not dumb. I haven't met a dumb cat yet .. some aren't as sharp as others but they certainly are not what I would consider dumb. Zaicha our rescue figured out if she scratched the bag of diet light food that she could tear a hole in the bag. Us "dumb" humans thought it was mice so we put out traps and caught a zaicha instead. (Don't worry the trap didn't hurt her just scared her).