i realize i am in the beginning stages of oldtimers' disease when I have to **** every half hour and the toilet bowl is mysteriously empty, every time? I have checked out the flush valve-check; the fill valve, too-check; the handle the seat, the bolts on the floor-no problem; when in a burst of enlightenment I remembered.... I have not filled Missy's ( my gorgeous well balanced love of my life Labrador)'s water bowl in two days.