Other food balls: An open type ball is another great choice for stashing snacks. Rubber webbed balls for dogs found in pet stores or amazon make an excellent pig toy. It works great to stuff lettuce, veggies, and grass clippings. The pigs will have to work to get the food out. You can also stuff some newspaper or cloth inside,crumpled up with pellets or treats. Another option is a whiffle ball with the holes. Just tape over as many holes as you need for the desired difficulty.