You bounce a tennis ball, and your dog wanders after it prepared for how it will land. The Chuckit! Erratic Ball keeps your dog on his toes, because it has a random bounce. Keep your pooch on his toes and ready to pounce in any direction. The Chuckit! Erratic Ball is made with natural rubber for a durable toy that your dog will love to grip and carry in his mouth. You'll never play fetch the same way again.