it's really hard to determine when the animal has crossed the line into that kind of decline.

That's just it. She's rallied so many times that it's hard to imagine she won't do so again. But each month she's that much weaker. And I don't want her to suffer. I don't want her to be miserable. But it feels so wrong to be making that decision for another being! But it would be unkind not to ...

Thank you for your comment. *hugs back*