I have an old dog, Sheri, who has suffered from autoimmune disorders for the past 4 or 5 years. I patch her together with thyroid meds, Rimadyl, and antibiotic and normal eye drops. I worry sometimes that I am doing this for myself and not for her, but she still seems to enjoy life and an occasional training session. She's a little senile, but we get along.
In some instances even anticipated loss is hard for this old guy to deal with. All that I can say is that both of us survived another winter.