cheap DIY toys for Kitty (poodle with too much energy)

Kitty gets bored in the apartment in Min Buri so I started making toys out of stuff we already have. Cost me nothing. A muffin tin with tennis balls under some of the cups. He has to pull them out and it keeps him busy for 20 minutes. A cardboard box with a few holes and crinkly paper inside, he loves it. A towel rolled up and knotted, he tears the knot out one thread at a time. A snuffle mat is easy too, just tie strips of old fabric to a rubber mat and put kibble in the gaps. Rotate the toys each week. If he always has the same ones he stops caring about them. And take away anything he can chew into pieces, like the cardboard after a while.