My kitty Sabrina is over 20 years old and seems to be declining. She was extra sleepy for a couple of days but perked up and was very hungry. I noticed yesterday that she pooped on her cat tree (where she usually hangs out and perches) and her stool was grey, smooth like sculpting clay and smells terrible. She has been frail for a while now, but was still interactive with the family. Now, not so much. I don't know if it's "time". If she is not well, I don't want to be selfish and keep her going because I will miss her. She deserves her dignity.