Robin,
Please don't regret anything. You asked good questions. You, and all the other people on here, made the very best decisions they could have made and they made them out of love. We may have hated the decision, whatever we chose, but we did what we thought was best for our pups. That is all that could be wished.
I know that Scarlett knew right to the end that I loved her more than breathing. I'm sure Polli knew the same thing. Every dog that we have lost has known that.
I wish the poll showed a better answer but it is what it is. There are those pups who have made it far longer than others, those are the pups that are the goal for what we all want. Because we are not there yet does not mean we shouldn't strive for it. Someday we will stop this horrible disease in its tracks! You, and all the others will have pushed us toward that goal.