Years ago I only had outside cats. There woud come time when they simply did not come home and after a week or so of hoping, worrying and fretting, the beloved pet was either found deceased or never seen again. My indoor only cats are a different matter. Two I gave away, but my beloved Butterfly lived with me from kittenhood to 17 years old. I knew she was failing, and her time was coming. I made the decision to let her die at home naturally as long as she did not seem to be in pain. Let me tell you, those last 6 months were some some of the hardest I have ever had to endure, but at the same time, I was in awe of the dying process. First Butterfly narrowed down her realm of the whole house to just the lower floor of the house. Sleeping a lot, eating less. Then she picked a favorite room and hardly ventured from it. Still sleeping a lot, eating little but still using litter box and responding to petting. Then, the day came where I had to search for her...curled up in a corner of the one room of the one floor she had chosen. I moved her to a comfortable bed in that corner, her food and litter box nearby. She only moved from bed to food to box and back to bed. But she responded to petting and still purred for me. It was so sad. (I am tearing up as I write this, it is so vivid in my mind). Next stage was when her food went untouched and she started to fade away before my eyes. If she tried to make it to the litter box, she had to lie down several times. But then, no food, no waste. Her little body started to break down. I put her in a little basket, and carried her around with me. I had come this far and wanted to be with her at the end. Each time I left the house and came back, I rushed to check and was always amazed when she moved, purred and looked up at me, still alive. One Saturday morning, I carried her box over to the computer with me, and logged on. Her breathing was very audible and I knew it was close. I kept one hand on her while I idly browsed the internet, and then very peacefully, she shuddered and died. It was the most heart-wrenching, bravest thing I ever witnessed in my life. I could NOT even talk about it for a good 4 months without breaking down. I WILL NEVER DO THAT AGAIN! My advice for anyone thinking of it, don't put yourself through it. When my dog of 14 years had kidney failure the next year and could not function properly, I took her to the vet and had her euthanized and it was much kinder to both of us. Sorry if I made anyone sad. I am all teary-eyed myself again, but wanted to share what it is like.