Half fill the TuckerBall with suitable dry food and watch the FUN! Food is dispensed from the ball in a measured fashion making it last longer. When the ball is empty it makes a noise when moved. Hours of fun and entertainment for all. The small TuckerBall is suitable for small and toy breed dogs. Choose the medium TuckerBall for medium sized breeds - Cattle Dogs, Kelpies, Border Collies etc. Select the large TuckerBall for large breeds such as Rottweilers, German Shepherds etc.