Here's the video with sound.

The earliest upload to YouTube is April 26^th, 2013.

The earliest article about the video is from RightThisMinute:

A dispute in Morocco left a man injured after a dog attack. An altercation occurred between a man walking his two dogs and a group of other people. The group began throwing items at the man, including trash and rocks. Dogs have a tendency to be protective of their owner and attacked one of the men.

^{Posted: 4/25/13 12:40 AM MST}

There is no new information whenever this gets reposted, just much of the same wild speculation.