We rescued our female cat (who is 11 months) Pip about 8 months ago. She's adjusted quite well and was usually very good with using her litter box. Recently other rooms in our basement (where the litter box is located) smell strongly of cat urine. Could she be stressed? We also have an 8 year old miniature dachshund who is very relaxed and they always get along. Pip is extremely timid around people she doesn't know very well. We are very neat with her litter box though - scooping everyday and cleaning once a week - and she still uses it along with peeing on the floor. What should we do?