Starmark's unique Everlasting Treat Groovy Ball will provide your dog with hours of entertainment. This virtually indestructible ball can be packed with treats and kibble to give your dog relief from boredom and anxiety. Sizes: Small - 2.5" diameter, for dogs under 15 lbsMedium - 3.75" diameter, 15 to 40 lbsLarge - 5" diameter, for dogs over 40 lbs | Starmark Everlasting Treat Groovy Ball in Purple | Size Medium