BUILT FOR MODERATE CHEWERS. Rumbl is a dry food and treat-dispensing, puzzle dog toy that encourages healthy play. Rumbl's unique “fish trap” opening makes for easy loading yet keeps dry foods and treats inside. Superior durability and hollow construction make this puzzle toy’s springy material heaven to a dog’s chompers while its playful wobble adds to the excitement and increases engagement. West Paw's Zogoflex Echo series feature an innovative, hollow core that creates an irresistibly squishy texture that dogs love yet remain durable. Perfect for games of tug, fetch, satisfying chewing sessions, exciting treat chases, mental enrichment, and physical exercise.