When we were young, there was a mouse in our kitchen that kept setting off the mouse traps and stealing the bait...
We had a black engora cat at the time with long black fur and green eyes - the Halloween special cat... He slept in the basement every night and we let him upstairs every morning... One morning, dad opened the basement door and there was our cat laying at the bottom of the steps with a grin on his face and dead mouse between his front paws...
That mouse must have wandered down stairs from the kitchen, because after that no more traps were set off and the bait stolen... He got the trap bait stealer...
They may be able to fool a mouse trap, but not a good cat.... :D