We have two female cats – sisters – we got them form the RCPCA when they were about 3 months old about 9 years ago. They were ok for the first few years and then the fighting started - lots of hair on the landing etc but no blood or scratches. It definitely isn’t play fighting
It gradually got worse and a few years ago the spraying started. They are outdoor cats, there’s never been a litter tray and it is mostly spray – on the sofa, up the walls, on curtains, small amounts usually but one of them started weeing proper on the kitchen counters and one of them weed on my bed covers when I was in the bed! The house is now like a fortress – bedroom door bolted at night, living room blocked from entry, planks of wood on the kitchen counter etc. Using spray deterrents and special enzyme cleaners just moves them somewhere else to spray. Have tried all the Feliways to no effect. The vets have checked them over and suggested various things (separated sleeping, feeding areas) but they still fight and spray/wee.
I work at home and today I just had to lock then both out for an hour due to several fights which disturbed my peace of mind and I discovered one of then had learned to jump over the planks onto the kitchen counter.
We live in a built up urban area there are lots of (bigger) cats around and foxes, there is nothing I can do about their stress from the outside. I believe they would be a lot happier separated but I am outnumbered as both DH and DD won’t let one go, DD because she absolutely adores them (as a small child she told them all her troubles) and DH because it will upset DD. I’ve checked around for people we know to take one (so DD could visit them) but there are no takers.
Phew, that was long, got it off my chest. I really don’t think there is anything I can do but maybe there is something I am missing??
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The litter tray
Nightmare cats
dabbler · 24/09/2018 16:21
NO litter trays at the moment, something to consider tho. I think they fight for all the reasons you state and also the dominant one attacks when she gets jealous of us petting the other one. She often attacks her and takes her spot. I think she wants her gone 
We have two sisters who were fine as kittens but now one completely and utterly hates the others.
We feed and give water separately and have separate litter trays. They need litter trays. They need to be able to toilet overnight and shouldn’t be out. Separate beds. Places one or other could hide. We have two cat trees and they are able to get right away from each other.
I honestly believe if we didn’t have a 3 storey house so they could escape from each other we may have had to rehome one. If they both want to go out at the same time we often have to let one out the front and one out the back. 
Honestly. We have one in our bedroom having been fed in the en suite and one on the back of the sofa having been fed by the front door. Tortietude. 
Oh, mine know when they're being told off and exactly why. They look at me with disdain and certainly don't want to please me, but they do understand The idea is removing attention for undesirable behaviour. Who knows, I may be deluding myself.
Two full of tortitude here too one is relatively new so it's been fun. I feed separately but they end up eating each others' anyway, they have separate litter trays and definitely don't share them. I agree with pp recommending litter trays, and with catification - Mademoiselle BrokenCat has commandeered the top of the wardrobe while Madam BrokenCat is older and wouldn't dream of making the effort to climb up there, so I have inadvertently provided a cat tree - should get an actual one which they will ignore Madam has rights to the bed and defends them vociferously, they timeshare windowsills and the sofa.
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