I'm at my wits end with this.
Backstory: We don't have a catflap, DCat gets in and out through the downstairs toilet window and has done since she was first allowed out. Window is open 24/7 (yes it's bloody cold in there!). I live quite rurally and the man next door owns a complete male. DCat is neutered.
DCAT is 4 years old. About 2 years ago she suddenly wet on the sofa (overnight). I had her checked at the vets and the whole sofa professionally cleaned. A week later the same thing, again at nighttime. Since then she has periodically 1/2 a week gone into the living room and wet on the sofa at night (when we are all in bed). She has a litter tray which she very rarely uses, only if it's snowing outside. She has never wet anywhere else in the house. Only in this one spot on the sofa.
About a year ago we fostered a dog for 4 months. The wet sofa completely stopped. She didn't do it once. Around a month after the dog went she started again.
Now, next doors cat has been known to come through the window at night time to steal DCats food. I've caught him on numerous occasions, well usually just his tail as he flies out the window. I think when DDog was her the cat didn't come in anymore as DDog slept in the kitchen where the food was.
So i'm thinking: either DCat is so use to weeing on that spot now after an accident she just won't stop or next door cat sprayed on the sofa and Dcat is warning him off (they have terrible yowling matches when they come across each other), next door cat could be weeing on the sofa? Not sure on this one as he is very twitchy and i'm not sure he'd come that far into the house.
The sofa is now completely unusable despite being scrubbed each week. I need to buy a new one but can't have this starting all over again. I can't shut her out of the living room or she yowls and scratches at the door all night. I can't shut the window as she does the same thing at the window.
Any ideas?