The parfait can be made in a large Kong or a hollow bone of a biscuit ball (I’ve even done it once in an empty tennis ball canister). Be sure to plug up the small end of the Kong or hollow bone and the three smaller bone shaped hole in a biscuit ball with either duct tape or a lightly frozen layer of peanut butter or cream cheese. Start layering with with yogurt (wet), then cereal or granola (dry), yogurt, banana, yogurt, etc. End with yogurt (wet). Freeze at least 6 hours (overnight is best). Serve and watch the fun!