We have a 6 year old cat - had her since she was a year. She's a sweet, timid little thing. Spends most of her time indoors but likes to go out exploring 2-3 times a day (and night). She's always had free access to the outdoors through the cat flap and hasn't used otter tray since the first few weeks we had her. I've left one out when there's been snow etc and she hasn't used it.
The problem is that in the past couple of weeks a large neighbourhood cat has been hanging around a lot and I've caught it come through the cat flap twice. This particularly concerns me as we are off on holiday for two weeks in a few days with a sitter coming for half an hour or so a day, same arrangement we've always had. I'm concerned that this cat will come in and hurt her while we aren't here.
Obvious solution is to lock the cat flap but I worry that would be distressing for her as she's used to going out and she might already be stressed if we're away. There isn't time to get a microchip flap and not sure it would even work as she manages to pull off and lose every collar I've given her. Might be a solution longer term but not something to introduce while we aren't here to let her in if needed.
At the moment, her food is quite near the cat flap, so maybe it would discourage the other cat if we moved that further away? Or are there any other cat deterrents that might work?