as questions says whose got a cat flap and what does your dog use it for!!
I have some pics that i will post up tommorrow by my lab like to use it as a door knocker. when she wants out she constantly flaps it til someone heres, and when she wants in she does the same and then sticks her whole head in and looks at you as if to say please. shes daft really she will get her head stuck one day she even tried to get a paw in with her head the other day what a funny site lol ;D