That is so neat, a kitty that loves lettuce and actually asks for it! As long as it won't cause any health or digestive problem, why not? Several years ago we had a dog that loved broccoli! Whenever I made it, I had to make a little extra for the dog. Did come to find out that my son wasn't eating his like I thought he was, when he thought I wasn't looking he was giving his to the dog who was quietly camped out under the table by my son's chair. A world without pets? I don't think so.....