Do you know who the owners are? If not, find out who they are. Is there a leash law in your area? Nicely notifiy the owners that you will notify the proper authorities if they don't keep the dog restrained and that you will take the dog to the pound if you have to. With that being said, if they don't keep their dog restrained please do what Lizzyanny suggests and take the little fella to a no kill shelter.
This dog is choosing you. Does he/she sense safety with you? You may have a best friend there. can you take it in? Is it hungry? Is it abused? Better to help him/her than take it to a jail to possibly be killed as unwanted. If you can't possibly take it in, check with friends, co-workers who might be wanting a needy friend.
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