We had a cat hanging around our chickens. It even tried to open the gate to the run, but was mostly curious and would lie in the flower bed and watch them. He found out he could make friends with my dog in his kennel and squeeze into his run, share his food from his feeder, whole lot easier than live chickens. He ended up being "Duke's cat". Duke died of old age (he was 17) and we never saw the cat again.