I don't know what was originally wrong with your dog (I try to stay away from the sad threads) but I had a dog when I was a kid that got really sick once. She was looking really bad one day and then the next day I left for school and she was like 100% better. Here's where the sad part comes in...she died the next day. I couldn't understand it because she had seemed like she made a complete recovery and then her death happened so fast. My mom told me maybe it was just that she wanted to spend her last day with me remebering her as she use to be. It didn't make me any less sad though but I was glad that I did have those last few moments with her being the way I use to be and so I could remember her that way instead of remebering her last day as her being all sick.