DIY Net Ball Horse Toy
Make a ball toy for your horses! Get a yoga ball or other large, soft ball, such as a beach ball, and fill it with air. Put the ball in a hay net or other large net that can be fastened shut. Hang the toy from a tree or fence post at a height that your horses can easily rub against it with their backs. Consider removing the ball from the tree occasionally for your horses to play with it on the ground.