I haven't done this for a long time but today I put Tibbe's lunch kibble in an clean, empty, open 20 oz. Diet Coke bottle with the cap off & he has been working on getting his kibble out of that for the last 20+ minutes - chasing that bottle all over the den, kitchen & even into the living room. I used to do this a lot & he got so good at the technique of how to hit the bottle & sling it that he could get all the kibble out in far less than 10 minutes but he's lost some technique in the intervening months. But he remembers enough to know that once a piece or several pieces of kibble bounce out, look well wide of the space where it/they fell out as one or more pieces may just go far out. He has searched all over the den after each successful ejection, thus taking more time & getting in some good search/seek/hunt exercise. He just loves to have his meal this way. Used to, he would bring the empty bottle to me, lay it on the floor & bark for kibble to be put in it. He's happily still at it, mouth wide open in a smile as he bats it about, working for his lunch.