We keep our cat in at night but he has free access to cat flap during the day.
We can lock the catflap but twice he's bypassed the lock mechanism and got himself out. I think he pulled the flap towards himself and somehow clicked it open.
We put something in front of the catflap at night at the moment but it is irritating. He associates it being covered with not being able to go out so he doesn't go near it. If we leave it uncovered, he's always having a go at opening it.
I have searched online for some kind of cat flap cover but I don't think they exist.
I want something secure but easy on and off. Maybe I could use a shower cap? Or some magical velcro thing?