I feel the same way, Wolf. But as long as the animal doesn't have a terminal disease, is not in pain or acute discomfort, continues eating, drinking, pooping, peeing (as in dogs and cats), is alert and responding to stimulus, I don't put them down - and little Pablo is! He's in no pain or discomfort, eats and drinks well, preens Codee and Codee preens him, they sleep as if glued to each other, etc. He even screams for his dinner when the sun starts to go down
I can assure you that, at this point in time, I wish I had a more practical nature when it comes to this type of decisions because Mikey, my ancient VERY large dog (going on 18 out of an average lifespan for his size of 8 to 10), hasn't been able to walk and has been incontinent for about 18 months which means I have to change (and wash!) his bedding three times a day and bathe him (with a bowl of hot water, shampoo and even conditioner) twice a day and I am already in 'caregiver burnout' doing this for so many months! People tell me to put him down but his liver, kidneys and heart are healthy, he is in no pain (he takes pain killers) and quite comfortable (he has an orthopedic mattress in the kitchen and I massage him every day to avoid bedsores -the dog doesn't even have a bare spot anywhere on his body much less a sore!), eating and drinking well (breakfast, dinner and treats) and he is as mentally sharp as he has ever been (snaps at the golden retriever if he tries to steal his treats and even barks when people come in -as if he could do anything about an intruder when he can hardly sit up for longer than a couple of minutes!) so I can't bring myself to euthanize him just because he is so much work for me... It wouldn't be fair.