The Freezball dog bone is a long-lasting and fillable chew toy for moderate chewers and anxious pups. It comes in two sizes for small and large dogs and is made of 100% natural rubber, which is non-toxic and biodegradable. The bone is dishwasher safe and easy to clean, and it can be filled with customizable or ready-to-use fillers that can be frozen for up to 45 minutes of entertainment. Fit moderate chewers Sizes Freezball is available in two sizes, small and large. This way you can choose the perfect refillable bone treat for your furry best friend. Sizes: Small (2.5" inches) - Up to 25 lbs dogs Large (3" inches) - Up to 40 lbs dogs