Firstly, just to say that I can't install a catflap as my doors are a "steel sandwich" and you can't just cut a hole in them. I can't install a catio as the garden is shared.
Next door's tomcat is driving me bananas. He made himself welcome in my flat and my two ladies were fine with him pootling in and out. They all sleep on the bed together.
We've had issues over food - I have to stand over feeding time as he tries to steal their food so I have to remove him if he tries to get in or take away any unfinished food.
Lately, he had taken to randomly spraying round the house. Rarely in the same place, so it's difficult to find unless you spot it glistening or put your hand into something smelly. I have the spray to clean it, but ideally, I need to stop him peeing. Other than shutting the house up, does anyone have any ideas..... other than nappies?