Sorry I'm late getting back after posting. It's been a crazy few days. I had 4 pans for two cats. I have my other cat's two boxes where he prefers them, but he'll use any box as long as it has litter. She has her two boxes in the kitchen where she seems to try to go to the most and his two are in the dinning room where she also tries to go right beside the back door next to the air vent so the dogs have a chance if stepping in it on their way in and out. She's peed in the vent before a couple times now! I have used so many litters for her. I've even tried sand, news paper, dirt, litter, and then a couple combinations on each. Yesterday I got her a really deep box and filled it with her favorite litter. I think she may have pooped in it, but it could've been the other cat. I'm thinking it was her, but the fact that it was covered makes me think it was the other cat. I just caught her trying to poop on the counter 10 minutes ago. I tried to set her in the new box, favorite litter and an attractant added in, and she growled at me (normal) and took off running. I found her in the bathroom trying to poop in a hard to reach spot so I pulled her out. it was a huge ordeal which lead to pooping as she ran and leaving a trail to clean up plus the bit on the counter. I'm at my wits end. I can't keep a clean house because of her. I will clean my counters and try to block them off with everything known to deter cats and boom, she's up there anyway making them coated in something I have no clue what it is. It's like a brown film that eventually covers wherever she sits. Eventually she tries to poop on the counter and pee on the stove. The vet has no more solutions to try and told us to accept she's a difficult cat. She shows no pain while relieving herself so I can't see any medical reason . I was using pads on the floor because she'd pee on them every time, but she pees so much it just runs off and under the pads. I have different litters for each cat so she has options. If I notice she's going into same spot over and over again I'll place a box over the spot. She will still go beside the box. I had a small hiccup in finding her litter when the pandemic started and it's like since then she will have nothing to do with the box. I've since found her litter and she still wants nothing to do with it. I'm honestly so tired of this. I'm supposed to be working towards buying a house with my partner within the year and I can't expect him to still be willing to do it with her being like this. He is very understanding, but I can't ask him to move in a house that can have pee and poo around any corner. I thinking maybe the other cat stresses her to the point of maybe being scared of the box? Anytime she's near the boxes I give her her favorite treats to do positive reinforcement, but she's still running from the box. I'm so stressed out over this I'm in tears tonight .