My experience is that there is no real effect as to whether or not you catch your target animal. However I think that a snare set with the lock on the side of the loop kills quicker than with the lock on the top. Reason being that with the lock on top the animal initially pulls straight ahead and often the snare locks closer to the body. With the lock to one side the animal is turned with the first lunge and begins to pull away backing up, thus the snare locks up under the chin and applies pressure to the cartoid artery, killing much more humanely. This would be my experience with canines not cats.