The faithful dog in Ipeúna, São Paulo, Brazil, saw that his human packmate was injured. He desperately needed canine support, especially as other, possibly hostile humans were converging around him.
Eventually, he broke free from captivity and rushed to his packmate, placing himself between his friend and numerous enemies. If it came to a fight, he would fight.
You can see the moving full video here. May all humans be worthy of such dogs.
-via Marilyn Terrell