Cat food clearance at Walmart

[MarkP]

One of the features of cat-proof fences is that they are floppy on top. Apparently cats hate that. You may not be noticing it but when your cat makes the leap to the top of the door he almost certainly contacts the door and boosts himself along the last foot or two. Also he has made the leap before and he knows the door is solid. Leaping into space and landing on mush is something the cats are generally not willing to do even if they theoretically can.