When you see the dog, sit down. When you are standing up, you are seen as a threat. Stay as still as possible. Put food a few feet away from you--smelly stuff works best. Hopefully it will be hungry enough to eat. Let it eat and leave if it wants to.

Let the dog come to you. This could take days, so don't expect quick results.

When the dog does come near, talk softly to it. It doesn't matter what you say, just keep talking. Don't make any fast moves, but hold your hand out slowly. When the dog lets you touch it, don't try to pet the top of it's head, but under the chin or on the cheek.

It may take a lot of patience and time, but it's worth it.

Good luck! And let us know how you do.