This is a fairly simple way to reuse an old tennis ball to make a fun and entertaining toy. If you've never played with a Foxtail, they are surprisingly fun. They're great for playing games like 500 and Flyer's Up, and dogs just love them. If you aren't the maker type, you can buy one here:http://www.klutz.com/catalog/product/1208
...Or you could make one yourself!