I have already posted a similar material before, but in the meantime it has got some update.

Videos and articles in Russian and English language about the training of a dog for the defense of its owner against human enemies. As a bonus for You, there is an unusual dog fighting trailer. Everything packed as one ZIP file:

http://www.megafileupload.com/9nP3/dog_bodyguard_-_sobaka_telohranitel_.zip