I have a 2 1/2 year old cat "Darla" and in March I bought a himmie "Savanna". Gradually, I have moved Savanna's litter box from my bedroom, to the 1st floor, and now to the basement where Darla's box is kept. This past Friday I finally put Savanna's box in the basement across from Darla's box. On Saturday, one of the cats pee'd on my bed. It was a big circle so I assumed it was "Darla." Well today, my kitten started to pee on the rug in my bathroom. When I flipped the rug over, there was a bigger stain. Are my cats marking territory? I don't think that the kitten can pee that much. Do you think it's because I moved Savanna's litter to the same room where Darla's litter is???? They both have had check ups within the last few weeks, so I don't think it's a health issue. Another thing that I have also changed in the last 3 weeks is the cat food. Since I had Savanna on Nutro Kitty and Darla would constantly eat it. I stopped buying regular food and Darla has been eating kitten food. My vet thought it wouldn't be a problem. Any suggestions????????