Balls by Jolly Pets. Details:Say hello to the biggest, baddest dog ball out there. The Push-N-Play is one of the most indestructible dog balls around and will stand up to the toughest dogs. Not only do they roll and float on water – the Push-N-Play dog toy will help your dog relieve pent-up energy. Designed for constant motion, the Push-N-Play Jolly Ball is perfect for energetic dogs that love pushing and herding. As a bonus, fill the Push-N-Play with water, gravel or sand for an added challenge. The Push-N-Play is available in 5 sizes and is suitable for pups of all sizes and ages! Jolly Pets is proud to manufacture the Jolly Ball Push N Play right here in the USA, and supports organizations throughout the nation that provide toys to shelter dogs. Jolly Pets believes all dogs should be Jolly, even while waiting for forever homes. For safety, you should always supervise while your dog plays with any toy.