They are rescue cats, about a year old. Not the sharpest cats I've ever had, but have had a tough start in life etc etc
Three months in they are healthy, glossy coats, getting fatter and are playing and meowing instead of skulking about.
But one does not 'get' the cat flap. I hold the damn thing open for her and she just sniffs my hand and looks at me contemptuously waiting for me to open the door. In the end I give up and open the door and she runs out. Hours later I see a little black face looking though the plastic cat flap and have to open the door again to let her in.
It's getting colder and I would really like her to be able to get in and out whenever she likes rather than waiting for us.
Any advice?