Let me start by saying I have tried just about everything. I have three cats, two female, one male. They are 5,6,7 years old. All three are fixed and have been exclusively indoor cats since I got them, which was between 5-8 weeks of age. They use their litterboxes about 99% of the time. I have 4 throughout my house, I use the fine clay type clumping sand. I tried changing the sand in one box and they refused to use it so I know they are ok with the litter I am using. I scoop everyday and empty once a week. I have taken them to the vet and all are ok. For some reason one of them (or all of them, Im not sure) started urinating next to the litter box on the carpet. I moved the box to a tiled area of the house but now they keep going on that one spot. I have cleaned, shampooed, sprayed 4 different kinds of pet odor stuff, I have the Feliway spray and the plug in thing. I even put the plastic carpet runner upside down covering the whole area so the plastic poky things are up and they urinated right on the poky things!! They have moved with us twice and have done this at each house. One house they decided to use the sofa next to the litterbox. I am at my wits end and I am looking into re-homing them. I know having an animal is a comitment but I cannot let them ruin my carpet and furniture. I now have to replace the carpet in that room and its only a year old house. I feel like we are living in a litter box and the smell is terrible. Obviously they are using it most of the time because I check the carpet everyday and its about once a week to maybe every ten days they decide to pee there instead of the box. All three were rescue cats, found on the streets at very early ages, so I feel like I have tried my hardest to give them a good life but I am beginning to hate them because of this. I have yet to catch any of them doing it so I don't know if its just one are all three and I hate to get rid of them all if its just one. I am also very concerned because one of them would probably have to be put down. She turns into a Satan like creature when she is around anyone new. The vet told us in his 19 years he has never seen a cat so bad. Please help I will spend any money and try anything to be able to keep them!!