My little crabby gelding that is scared of everything and I do mean everything just loves his big ball! I was so surprised. We joke that it is his way of releasing his pent up anger. I even have a video. We have so much fun playing with it. Your horses might surprise you. I know mine did.
We had a couple of beach balls out there to see what they would do. Sugar would chase it when we sent it rolling and kick it a couple of times then ignore it. I could throw in their general direction and they, including her. Just watched it roll by. Send a mid sized dog out there then they all want to smell and get to know it. Too bad for a nervous dog because as soon it starts to run away they all think its time for a game of chase and 2x3 they let out after it all the way to the fence. Then they will stand there looking over at it as if calling it a cheater for leaving the pasture. It is hilarious to watch.