Engage Natural Instincts- Unleash your dog and horse's natural instinct for herding. Excellent for non-herding dogs; Just use as a general big ball for dogs. Sturdy Construction - Large herding ball for dogs with an extra thick PVC inner ball and a durable Oxford cover to standup to rougher play. In The Box - Giant Pet Play Ball and Outer Cover, Inflation Pump INFLATE UNTIL COVER IS TIGHT - The inner ball is strong enough and designed to be inflated until the outer cover no longer is loose. This will reduce tears. NOT A CHEW TOY - While extremely durable, do not allow dog to chew on Giant Pet Play Ball Giant Pet Play Ball Herding Ball for Dogs, 24"" Includes Durable Cover and Inflation Pump, Herding Balls for Cattle Dogs, Herding Ball for Australian Shepherd, Large, Blue