The whole problem with the way things operate today is that they are "allowed" to be determined emotionally and often illogically. That dog looked wild and probably was dumped some where in the country. Why?
Have you ever tried to take a dog to the "humane" society. They typically don't take any (they are full is the excuse) in and now have placed cameras outside their buildings to catch people who drop off their unwanted animals when it is closed.

We are hunters for a number of reasons, one is population control. Wild, unwanted dogs need to be controlled as well, that's why the "humane" society destroys them. If you guys want organizations like them to be the only ones allowed to use this form of population control keep allowing them to prepare the battle grounds. Why didn't they just destroy the dog? They destroy how many a day? Emotions. Take that weapon away from them and their done. This dog should have been done the first time some one saw it this way. THIS IS WHAT RESPONSIBLE PEOPLE DO!!! THERE ARE PAINFUL THINGS IN LIFE THAT HAVE TO BE DONE!!! People should be outraged that it wasn't done and quickly.

Turn off the tv, cut the supply of money going into these organizations from the media and take a couple years of your life and read world history books (at least 100 years old, not new revisionist crap) and you will see, these tactics are as old as the hills and as destructive as a world war because societies that allow this kind of rule don't last long, even countries that were super powers.