@eeeefarm I think quality of life doesn't just 'come into it' - I think it is everything. To keep a dog going when the quality of life has deteriorated a great deal is thinking of oneself, not the dog.
Sometimes there is only one decision you can possibly make to show an old friend how much you love him or her and that is to make a decision which hurts you. To let him or her go with dignity when it is time.
Mine have almost always come and told me, Mom, please help me. And I would, as someone on this forum said a year or so ago, prefer always be a day early than a day late.
Eating is a good gauge of quality of life, but it mustn't be the only criteria. There is so much to take into consideration and I am the first to admit it is a time I absolutely hate.
Hoover who died in August, is the first one in all these years of running a pack of Basenjis who has not died in my arms, here in the garden. She died in the car, racing towards the vet on a Saturday morning. The first one I wasn't cuddling.
So I DO understand and my thoughts are constantly with all of you who have to go through this - but believe me, knowing you are doing the best for the dog you love, is itself a consolation.