I do have a lot of yard and my cat does roam and one of the reasons we have a cat is to kill chipmunks. It works. Our neighbors complain that their decks are undermined and chewed up. Chipmunks carry diseases including the plague and my cat has all his shots and is chipped. He weighs enough that the wild animals don’t bother him and he insists, loudly, on being put in the basement with his food at 9 p.m. He has his job to do but does it early in the morning. Doesn’t bring the critters home but we have noticed that during the spring and early summer he doesn’t eat as much cat food.