Toy Buddies Vinyl Treat Ball for cats www.petco.com - $3.99 Product Description: Turn treat time into playtime for our Vinyl Treat Ball. Just load with your cat's favorite treat. They'll dispense unpredictably as she rolls and nudges the Treat Ball. Fun way to make your cat work for her treats and encourage physical activity. Raised mouse pattern makes the ball roll haphazardly, increasing the fun and mental stimulation for your cat. One piece, easy to clean design is finished in pet-safe paint. RattyRat's Review: This is the best treat dispensing toy we have found. The one shown in the picture above was found in the ferret section at Petsmart, however to get it online you need to go to the cat section at Petco. You can also find a bunny version of this toy as well. This toy is very sturdy and durable, and comes with an adjustable opening allowing you to make the challenge harder or easier for your rats to get treats out. Rats can have tons of fun rolling it around to get any variety of treats out, although females are much better at it then males. To teach them how to use it, show the opening to them and roll it over to show that treats fall out. It might take them some time to learn how to use it, even weeks. Just keep exposing them to it every day. Don't leave them alone with the ball unsupervised though, because they will eat a hole right through the ball to get to the treats inside given half a chance. Our treat of choice to put in the ball is Rice Krispies.