The same thing happened to my dad and myself back in Oct in the middle of Kansas. We were out for the weekend training our own pups when after going thru a field we looked back and saw a dog in the middle of the road. Drove down to him, a good looking black lab with a collar but no tags and he was skinny. Took him to the closet house 2 miles away and talked to the fella he didn't know of anyone missing a dog. Took him back to house in town (brother in law bought a hunting house out there several years ago) house is across the street from the church and we knew a couple of folks that went there. Fed the dog a couple bowls of food and when church got out went over and visited with the guys we know. They came over to see him and saw we were packing up to come back to town. One of em offered to take him and make some phone calls to try and find the owner. Then the 2 guys started to argue on who should take the dog, the guy that 1st offered stated to the other that were we found the dog it was closer to his place, the other guy countered that the other fella offered 1st. So off they went.
I didn't make it back out until the 1st of Dec. for my 1st hunt. Again we were packing up on Sunday when church got out and here come both guys. They had made several phone calls and also placed a message with the local radio station and did not find the owner. It turns out that the second fellow that did not want to take him ended up taking him and said he was great around the farm.
Went back 2 weeks ago and stopped at the fellows farm that kept the dog. He wasn't home but his wife was and I told her we were the ones that found him originally. They already had 1 black lab and they had a female that had past away a couple months ago. She told me there female always used to go down the drive and bark at the sprinkler heads and the new lab does the exact same thing and she was just in love with him. Looks like we found the right owners!