Dogs have been man's most loyal and protective companion since they were domesticated thousands of years ago. They have been by our side through thick and thin, and to this day, we rely on them for protection and companionship. This man's dog took that relationship up a notch. When he was tragically killed on the streets, his dog came to his side and wouldn't leave. Not only that, but if anyone came close to his owner, this dog would start barking in order to protect him. What an incredible bond. This video contains some graphic images. Get ready to grab some tissues... There is no denying the special friendship these two had...and their loss breaks my heart.