Sometimes people can be so bad. Never did understand how someone could take an animal and be abusive to it.
You have gone the extra mile and have done all you can do for this sweet little baby. I'm afraid that the next time he got loose I would have to take matters into my own hands and find him a new home. I would want to keep him personally but then you run the risk of the owners finding out that you have him and then you could be in big trouble. He needs a good home further away so they can't find him. They don't deserve him at all. Fleas???? Cold???? Outside tied to a tree????
They don't care at all about this little guy.