Shirley, you got a foster dog!? That's so great.
Yes, maybe it will work to get sable back. I had that discussion too, that if we got another dog, spencer would probably turn up. If we absolutley in no way without a doubt could not find the owners of Teddy (the dog going onto the highway), we were going to keep him...and everyone said if we had to keep him, spencer would return lol.
That's amazing that you can do that though. I don't think I could handle losing a dog, then building an emotional attatchment with another one because I wouldn't want to give him up if he was a foster dog. Good job for you!.