With that tale, I would not expect the owner. I'd go through the motions for looking for the owner but have a plan B.
If you really like the dog, find a friend you really like to give him to (tell this to hubby). Or if you have "saved" a lot of strays by keeping them, find a home for one of the others and don't feel guilty. Which of your other dogs is least suited to your home? You can list them on Petfinder.com at a site, I'd have to search for it again but you can get dogs on petfinder and then screen adopters who apply, I could show you how to do that or do it for you. If you start to rescue dogs you need to find the way to give them away or else you will become known as the place to drop off dogs and eventually you will have more than you wanted. Tell hubby you know someone who has given away at least 200 "really good dogs" and you could be very very important to that dog, not as his owner, but as his savior.
If you really don't want another dog, just insist with hubby that he choose ONE dog to give away to a different home. Tell him you have "set a limit" for yourself at the current number. That is what rescuers do. Our limit is 5 personal dogs. No mas. No way. No more. For a while we kept six when we took my daughter's dog, but that was just too much for us since we foster as well. But tell hubby if he wants to rescue dogs he needs to do it the "right" way and find them homes if you already have too many dogs.
Establish the pattern because it will happen again, the doggie angels send the dogs to the rescuers. If I were you, I'd try to find the local group that lists strays on petfinder as there is probably one by you.
