cheap diy toys for pocky, no shopping needed

Pocky is a corgi and he is very smart but also very bored at home when I work. So I make toys from things in the house, cheap or free. First one: empty toilet paper roll, put some treat inside and fold the end. He spends 20 minutes with it every morning. Second one: old sock with a tennis ball inside, tie a knot. He wants to tear it, that is fine, it is his job. Third: cardboard box with holes cut, hide his kibble inside and let him find it. Corgis are very food motivated, so this one works very well. I change the holes every week so it is still new. Last one is my favourite: muffin tin with tennis balls under the cups. He pushes them one by one. I put it on the carpet so the balls don't roll too far. Costs me nothing. Pocky is happy and I can take a shower in peace lol.