We recently had to put down two of our elderly horses. They were in their mid thirties. They were both dropping weight like crazy, but one was not as bad as the other. I felt the same way, but knew in my heart it was for the best.
Ugh, everything makes me want to cry my face off....This is why I hate dogs, we get far too attached to them than other animals and it's just heck when one has to go...