I'm so sorry to hear this. I think it's the news we all fear and dread. I have not experienced it yet (thank God), but some friends of mine recently went through it with their 9-year old grey. They also decided not to proceed with treatment and chose to keep him as comfortable as possible. They knew when he was unable to take walks around the back yard that it was time to let him go. They also had in-home euthanasia. They cherished every moment they had with him and were able to get lots of photos and memories to carry them through the mourning period (if that ever really ends).
I wish you the best and longest time possible with Roo.
Kathy and I bawled uncontrollably on Friday night once it sank in. That initial feeling of helplessness was indescribable. We still get choked up thinking about it but we've shifted into gotta-do-this-for-him mode now.
We appreciate the feedback about the walks around the back yard, Phyllis. That's definitely helpful. Roo's guilty pleasure is to sneak into our youngest son's room upstairs and sleep on his bed, which is the softest. I suspect his inability to do that will probably be a reliable sign for us. We've been through this decision once before with our previous dog, an Aussie mix, but she was 14 years old and in really rough shape--that decision, while still painful, was fairly clear-cut. I'm really worried this time things won't be quite so clear.