my cats urinates everywhere. she had been toilet trained since she was very young, then all of a sudden she started to urinate everywhere, we have another female cate (from the same litter), so i dont know if she is marking her territory or if it is a behavioral issue. she does also use the litter tray quite often but, she still seems to urinate throught the house. We had her spayed 2 months ago, and that hasnt seemed to make much difference. Is it a behavioral thing or is she marking her territory, and what can we do to change her behavior?