If you want to discourage it. Try squirting water at it from a water bottle, especially when it has its face at the cat flap. It won't like it but it won't hurt it. Hopefully it will soon learn. Good luck
Will try that. I almost had a chance to cat sit for them weekend just gone and I thought... hummmmm... I am so gonna teach him a lesson... then they cancelled their plan last min...
(PS: I wasn't actually going to do anything to the kitty... but the thoughts... lol)
If you want to discourage it. Try squirting water at it from a water bottle, especially when it has its face at the cat flap. It won't like it but it won't hurt it. Hopefully it will soon learn. Good luck