Thank you, everyone, for your well wishes and support. Your kind comments make this time a bit more bearable.
Quick Spencer Update: He's been home for a few days. I carry him from room to room and try to get him to eat a little food morning and night. He wants to be near us. If I leave him in another part of the house, he will sometimes hobble to find us. Then he lays down and sleeps for hours. We went to our regular vet yesterday. She is sending us to a neurologist because she does not want to do anything "drastic" (her word, not mine) without a second opinion. Many people think I'm crazy for spending all this money on an 11 year old dog. But I feel that his faithfulness and love for over a decade cannot be discounted or discarded. If he still wants to be with us and I can make him comfortable, I am going to continue caring for him.
Thank you again for your kind words--I will carry them with me on this journey.