Hi everyone and thanks in advance for your replies. I'm at the end of my tether with one of our cats that we rescued from the streets of Sheffield. She's been with us for about 8 years after turning up one winters snowy night and we let her in through the cat flap that was already in the door when we moved in. We checked for a chip and put up posters etc. but no one claimed her. We suspect she'd been processed by a Sheffield based feral cat charity who catch, spay/neuter and release as when we tried to use the voucher given to us by RSPCA the vets said she had already been spayed. Anyway... she started spraying in the house and at first we thought she was just marking the place as her own since she'd not lived there before. We cleaned it up properly and installed some Feliway plugins. The spraying calmed down but she'd still spray on anything new we brought into the hose. Fast-forward 5 years... we've moved house and got a 2nd cat. They tolerate each other very well and will sleep next to each on the settee when we've sat watching telly. They even play in the garden together once in a while. They have separate feeding areas, 3 litter trays, multiple plugins and can come and go as the please with our smart cat flap but.... she's still spraying. The new cat who was also a rescue and spayed at 2 years old while in the early stages of being pregnant has never sprayed once. Anything new we bring into the hose, flowers, bags and rucksacks that we take out of the house and then bring back, never shoes though. She also sprays anywhere that the new cat sits even if she doesn't ever sit there and recently she sprayed on the bathroom bin, while I was sat on the toilet and into the back of my car when I left the boot open taking things into the house. She must know it's wrong as she'll do it in front of us and immediately run out of the house and not come back for hours. When she sprays in the garden she doesn't run off at all and it seems she's only doing it in places to spite us / the other cat. She's sprayed this morning on a rucksack which the other cat sat on top of last night for 10 minutes while I was eating my tea and it's all over the settee, the rucksack and everything else that was on the settee. I've chased her out of the house and removed her from the cat flap memory so she can't get back in but I just don't know what to do now other than to buy a wendy house or something and to install a new cat flap and make her live outside / in the wendy house. I feel terrible but I'm also really angry and sick of it.