This toy has a hole in the ball so that you can put treats inside. It comes in two sizes: small and large. Those who have purchased this toy say: It’s a great toy because dogs will push it around for a long time and are more focused on rolling it around for treats than chewing it. It’s tricky enough so that the treats don’t fall out too quickly even if the dog has already figured out how to get the treat to fall out. It’s pretty tough but not tough enough for aggressive chewers, who might chew through the ball to get the treats. The toy is made of a softer vinyl material so it’s not as noisy when rolling around on hard floors.