I have a "single kitty" and three weeks is actually not that long to use the same litter as long as it is clumping litter. I change mine once a month and it still doesn't smell when I do it (just make sure there is enough litter in the pan so kitty isn't peeing directly on the pan).
Well, all I can say is I am glad Gizmo stopped but I sure hope it doesn't start up again in a different place. It is best to nip these problems in the bud because I believe that it can become a learned behavior over time (even if it is caused by a UTI). You have always mentioned what a nice, affectionate kitty Gizmo is so I hope you don't have further problems. If she does do it again, please consider a vet visit.
Well, all I can say is I am glad Gizmo stopped but I sure hope it doesn't start up again in a different place. It is best to nip these problems in the bud because I believe that it can become a learned behavior over time (even if it is caused by a UTI). You have always mentioned what a nice, affectionate kitty Gizmo is so I hope you don't have further problems. If she does do it again, please consider a vet visit.