How do you get grown up cats to stop shitting in your house?
Inititally both my cats were litter trained and I had no problems, then when my brother brought a dog home the cats were too scared to come downstairs for awhile and they started shitting under the beds.
Once they adjusted to the dog they came back downstairs, but now they continue to do it.
They completely ignore the kitty litter and choose other places in my house.
First it was under the kids beds, meaning I was always cleaning and washing the carpet. Then because I read that no amount of cleaning the carpet will kill the smell that keeps making them return there, so I ripped all the carpets out and sanded the floor so they stopped choosing that spot.
Infact at this stage I thought they had just become cats who shit outside the house.
Then i bought a mat for my inside hallway and they started to pee on it. End of that mat.
And today one of the bastards did it in my bedroom.

I can't take this bullshit no more. Sick of cleaning up after them.
I read one one advice site that I should lock them in one room with their kitty litter and feed them and keep them there until they readjust to using the kitty litter, but I don't have a spare room I can do that in.
I did it in my kitchen, and for the 2 weeks they stayed in there, they used the kitty litter.
Moment I let them out they were back to using anything but that.
What can I do?