My pigs used to hide their food bowl so that I would have to hunt for it. All the whole they would excitedly follow me around.

I got the a horse ball, the kind with the big handle on top. They stopped hiding their food bowl and would play with the ball instead. When I went down to feed them I would ask them to get their ball and they would bring it to me. I would kick it as hard as I could and they would chase it and bring it back. We would play soccer and keep away and they were happy.