My cat was 15 when her kidneys failed too. We had her on saline shots for a few days (she was dehydrated, then after the shots, was alert and perky again, then she would fade out by the next day). My mom got her the shots until my brother and I could come visit (this was during July 4th a few years ago). After seeing her like that, I decided the shots weren't worth it. (it was like $6/shot at the vet, and without it, she'd die anyway). It was just prolonging the inevitable. It sucked, but I think it was for the best when we had her put down. 15 years is a long time. I still miss that cat.
