I have to say I'm kind of bothered that no one is considering the possibility that this dog may be someone's lost pet. Some poor family could be missing their dog horribly.
He's beautiful, he's well fed, and in all likleyhood he's somebody's baby.
I will not post again on this thread, but for this last plea: PLEASE at least get him scanned for a microchipped, and check with the local shelter to see if someone is looking for him.
Put yourself in these shoes: both of your dogs run loose- only one comes back. Wouldn't you be devestated? Wouldn't you want someone to bring your dog back to you?
I sure would.
I mean, if he doesn't have a family who is really missing him, then sure, keep him. But at least give it a chance to bring him to his rightful people if they still want him.