I second the suggestion to call around to other vets. You and Chancie need and deserve kind, sympathetic people to help you through this.

I also agree with those who say you're doing the right thing. I waited too long with my beloved dog Betty, and she ended up dying at home alone while I was gone to school one day. That was eight years ago, and I still feel guilty that I wasn't with her when she went. If I had it to do over again, I'd rather put her to sleep a little early, and be with her, than have her go alone.