Russian Blue Cat

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My cat keeps peeing on the bottom of our staircase. I think I've figured out what started it: we brought home another cat, after one of our cats ran away, and he started peeing all over.
He occasionally pees in the basement whenever the basement door is open.
We've tried having two litter boxes, changing the litter, having only one litter box, changing his food, and we even got rid of our other cat and started over again!
He doesn't have any health issues, he's strictly indoors (Completely by his choice. He hates the outdoors.), the only pet in the house, age 13 in SHY (Standard Human Years), gets attention anytime somebody's home, a Russian Blue breed.
I don't know what to do!


  • Have you taken him to the vet to rule out a health issue?
    – Zaralynda
    Commented Aug 3, 2017 at 18:20
  • Yes, but they've found nothing wrong with him. Commented Aug 3, 2017 at 19:35
  • How have you cleaned the places he's gone? How old is he? Has he been declawed? Have you tried locking him in a bathroom with a box for a day or two?
    – Zaralynda
    Commented Aug 3, 2017 at 19:37
  • I marked your question as a duplicate for now, but please come back and edit the answers to these questions into your post so we can help you. There are just too many possibilities without this information.
    – Zaralynda
    Commented Aug 3, 2017 at 20:38
  • Are litter boxes covered? Tried moving the litter boxes elsewhere in the house? Is he neutered? I'm assuming your vet obtained a sample of his urine for urinalysis? Is his stool normal in appearance - sometimes inappropriate urination can be caused by bad associations with the litter box due to constiption, etc.
    – Harry V.
    Commented Aug 4, 2017 at 4:59


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