My cats have a kitty door in the window of the spare room that leads to a small 'balcony' (shelf). When I feed them, Ghost stays inside to eat his carefully rationed meal and the others eat on the balcony. I put the wooden door in the kitty door so he won't steal the others' food.

Guess who figured out how to slide the door up and out? Yup!

No wonder he's still chubby.

Mary