The Natural Rubber Polar Freezable Reward Dog Toy is crafted from durable and flexible natural rubber, providing a stimulating mental and physical playtime for your furry friend. Fill it with water or their favorite broth and freeze it for a refreshing cooling treat. It is designed to be stackable, allowing for the creation of various frozen treats. This toy is perfect for dogs who enjoy fun challenges and can be conveniently cleaned in the top rack of a dishwasher after use.