Cats don't spray "to spite you. " They don't have these retaliatory behaviors. I would first have your cat checked for a urinary tract infection.
Many cats who pee or spray outside of their litterbox have it and they may show no other symptoms. Second, since you keep the litterbox clean, that should not be a problem, but clean it anyway just to be on the safe side. I would scrub it out too so that the smell of the other UTI doesn't cause her to get upset.
Spraying occurs for various reasons. Most cats spray (spayed and intact) because of changes in the house, such as new pets, changes in the furniture or furniture arrangement, new pets, new people, loss of people, or just generally feeling uncomfortable with their surroundings. You mention moving the litterbox -- this could cause a cat to get upset.
Now, you should have enough litterboxes for each cat and in different areas. You should use feliway to keep the kitties calm and happy. If you've moved things around or have introduced other things like new furniture or something else, then spraying feliway on it will calm things down.
Spraying the areas where your cats sprayed with feliway every day will eliminate the spraying there. Good luck with your kitty!
It is less common for a spayed Cats|cat to spray but some still do. It is usually caused by a change. For example, a new pet, new baby, new house, even changing the location of the litter box or furniture can make the cat spray things.
They can also spray due to illness or stress. Think about any changes that you may have made lately. If everything is the same you might want to take her to the vet to rule out illness.
I also read that some female cats will spray to mark their territory. Make sure you clean it with something that will eliminate the smell or she'll likely keep peeing there.
Your cat is diabetic take it to the vet and get her Blood Glucose tested.
There is a spray by Feliway that stops cats from spraying. It sounds like she is urinating over jealousy. helpwithpettraining.com.
One thing you might try is separate litter boxes for the cats. Some cats are very protective of their potty spots and dislike sharing - so if you have a separate box for the other cat it may help solve some of the issue.
If you do "give her away," try to find a no-kill shelter. I can't think of anyone who would want to adopt a cat that has exhibited those behaviors, and it wouldn't be ethical not to divulge the information, even if it's possible that she wouldn't in a new home. If Sooki is doing this because of any change in her routine, imagine her in a new home.
I'm speaking from experience, having adopted a beautiful ragdoll cat that was about to be gassed at our local "shelter," having the spray/urination problem despite separate litterboxes and several trips to the vet, trying different things. We finally had her euthanized at our vet's. It's a surprisingly OK thing when the vet does it right (a shot to calm her, then the lethal dose, all while I'm petting and talking to her).
And much better (to me) than the alternative of the gas chamber, which they still have here in NC.
All cats mark their territory against other cats and maybe other threats to their security. Spayed cats do not spray as much.
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