Your post made me cry. Last year my 13 year old greyhound "Wink" woke me up at 3 AM. I went to the back door to let him out but he went to the front door, wanting to go for a walk. One week before he had collapsed on our walk and I had to carry him home. The vet said no more walks for a while, but he was insistant, wagging his tail furiously. Despite the hour I gave in and we went for a walk. When we got to our usual turn around point he stopped and just looked around for about 10 minutes. Then he turned around and we went home. It was the last walk we ever took. He passed away 2 weeks later. I think he knew his time was near and wanted to go for one last walk while he still could.