The Chuckit!® Hydroroller is perfect for pools lakes and beach play with your dog. The internal reservoir in the flyer is designed to hold water and spray when thrown or rolled for games of ground pursuit fetch. Watch as it sprays water while your pup tries to catch it The added play dynamic of water helps keep dogs cool in warmer spring and summer weather. Submerge the Hydroroller in water to easily fill the reservoir. The bright blue and orange colors provide high-visibility on land. Made from durable rubber. One size that is suitable for most breeds and sizes of dogs.PRODUCT NOTE: Supervise your dog during playtime and remove the toy from your dog if it becomes damaged or parts become separated. No dog toy is indestructible and every dog interacts with its toys differently. Supervised play will go a long way to helping your dog's toys last longer.