Never knowingly had a problem with other cats coming into our house, that's not to say they haven't been in but I've never caught them coming in/smelt any spraying.
In the last six months it's become a massive problem, I come home and hear cats racing out my catflap, I've caught them sitting on my sofa and the other night I slung my leg out of bed to go to the loo and almost trod on a visiting cat who then had the cheek to growl at me before scarpering!!!
I've obviously got a Tom coming in too as I can smell cat spray which I've never experienced before either, that is what has prompted needing to find a solution. With another baby on the way and a cat that is so passive he won't chase other cats out I need a solution!
Are microchip cat flaps the solution? Do they work well and totally stop other cats bullying their way in? Is it possible the other cats may still be able to push their way in with force and break the cat flap?
Are there brands/ types that are better than others?