I have a real quandary!! Moved into our new house in December with Theo Cat .. big old ginge and white 3 year old boy.
There was a normal cat flap and he soon settled . 2 doors down live 2 Havana Brown cats ... they came in , stole all the catnip toys and were getting up on kitchen counters which my cat doesn't . I bought a new cat flap which works on Theos microchip and thought problem solved ... NOPE !! It was ok for a few weeks but now they are getting back in .. I caught one of them in the kitchen and it stole the packet of dreamies . Theo is looking a bit fed up and sits by the cat flap like he's guarding it !! By total coincidence I was away last weekend and had a " kitty angel" come to feed and play with Theo .. she knows the owner of the Havana's and they did go back home with the dreamies !! She saw how they get in .. despite the locking microchip flap they are hooking up open with a claw somehow !!!! ... I'm baffled with how to keep them out now ... sorry for long post but has this ever happened to anyone else ?