hello we have been having problems with my persian/humilian cat i think she is 18 yrs old she doesent seem to want to use the litter box we had the litter box upstairs to where she could get to it easier then we moved it down to the basement so she could have her privacy that did not work so we bought another litter box got the expensive one that cleans its self she did not use that so we bought just a standard litter box and i think we tried like 6 different cat litters so what else could we try we even took her to the vet when it began