run-away dog

[mojosmama]

Hi there,
I have a problem. Several weeks ago a lady in our neighborhood (6 blocks away) lost 2 labs....she saw me walking mine and asked me to catch her dogs if I found them. She gave me her address too.
2 weeks later I found one of the dogs while taking a stroll with my own. VERY sweet lab about 18 months old. I took him home and went to find her house and she followed me home to get him.
2 weeks LATER it was storming out and we had 2 tornadoes hit our neighborhood...I was pumping out my garage due to flooding and here he comes, roaring up scared to death, filthy, VERY thin and VERY happy to see me.
So, we left a note on their door, cleaned the dog up and fed him and let him stay in our washroom until they showed up. They came and picked him up around 11 pm that night. They said he jumps out even with an electronic collar, etc. I know they like him but didn't seem at all concerned that he was gone, etc. I suggested they keep him in the house, etc until they figure out a better way to keep him.
Today, he was at my door again. This time I took him to the house he actually lives in....a close neighborhood that was walking distance. You could tell he'd never been walked...moving on. I threw some dog treats in his yard and put him in it and locked it. The fence has a HOLE in it....duh. I tried to block it as best I could and I told a neighbor what I was doing so they wouldn't think anything suspicious was going on. He went on and on about how they don't take care of the dog and it tears everything up and barks all the time, etc.
Before I could even get back to my house, here comes the dog tearing down the sidwalk, darting in front of 2 cars . He actually BEAT me to my own house.
Okay....I've already gotten the lecture from my husband about this. What do I do though?
Is there anything I CAN do? I mean, can I call animal rescue or lab rescue since I know where the dog LIVES? I can't find him a home because he is owned by someone else. he doesn't seem to be being abushed, just neglected. But I know I'm going to see him squished on the road one day. (we live RIGHT off a major thru way 7 blocks to be exact.)
any suggestions? They never foudn the other lab and were like 'oh well, we didn't worry about her,' I asked about posters and they they didn't want to deal with that sort of thing........................I just keep hoping that a nice family took her in instead of an animal lab....