There is a huge amount of evidence that domestication did not happen once or in one place but many times in many places around the world. This evidence points back as far as about 135,000 years and as close as about 15,000 years for each of these events in time where wolves domesticated humans. It is speculated that wolves did this for two reasons: fire and thumbs for scratching.
It is not surprising that there would be multiple domestications. A human plus a wolf are far more powerful at defense and offense, at hunting and guarding than either species alone. Our social structures are very parallel and our physical abilities complement each other.