This lightweight, inflatable ball bounces and rolls with ease over outdoor terrain, giving your dog the perfect target to push and herd to their heart's content. It's an excellent source of exercise for high energy breeds that won't be satisfied by simple walks around the neighborhood. To protect it from punctures and tears, the ball features a cover made from the same ripstop ballistic fabric used on our Tough beds. The double zipper closure with sealed exterior zipper and detachable pull ensures that the cover won't open during playtime. If needed, the cover can be removed and machine washed, or you can simply hose it down outside to wash off any dirt, grass, or drool left behind. A portable air pump is included. The ball may shrink in cold temperatures, so for best results, inflate while it is cold out and store the ball in a warm room when inflated to minimize shrinkage. This ball can take a long time to inflate by hand; if you wish to speed up the process, you can hook it up to a floor pump, electric pump, or air compressor (not included). This is not a chew proof item and should not be left unattended with destructive chewers.