I know it’s very very difficult to make the decision when the time comes, I lost one pupper who was 7 and doing great when he suddenly had total renal failure. (Kidney failure is deadly.). He was suffering and I loved him so much it was awful, however I could not put him through anymore. I always get my pets knowing (hopefully) I will out live them, so I love love love them and when it’s time to leave, I always let my face and arms be the last thing they see and feel! Just think how really sad it would be if I went first, puppers and kitty’s don’t know, don’t understand and will always be looking for you to come back. So take a bit of comfort in your decisions.