He was wearing a collar, no tags. We are going to have the vet scan him for a chip. We won't keep collars on our dogs so they are chipped. We crate them, and collars, especially with tags are dangerous. Plus, since Lily is a show dog (or supposed to be), a collar would damage the hair around the neck and tags stain. She also roughhouses a lot, another hazard where the dogs can get their jaws caught and broken in play. They do wear collars with tags when we travel though.
We also contacted the local humane society in that area who gave me the number for animal control, and they are also going to check with the local vets.
If we don't keep him, I have a blind friend who's guide dog is getting old, and he had been thinking for some time of getting another dog as a pet. This is his final guide dog as he has mobility issues now from diabetes complications. He did try a rescue dog once, but those people tried to place a freaky, untrained dog that would not come when called. Great for a blind person, don't you think? This dog could be ideal.....