We give Malone 2 kongs everyday, and everyday he gets something different. We got some liverwurst (yuk!) and smeared it all around, peanut butter, yogurt, cottage cheese (not too much), regular cheese (melted and then frozen), gravy, and pretty much anything that can get smeared way in the back. That way it smells really good, and it takes them a while to get it all out, and then lose interest. We also put baby carrots (2 or 3) stuffed in sideways so that he can't just pull them out. As he learns to get things out faster & faster, we always try to slow him down by trying new things. It's lots of fun!!