In light of what I have just read, this just crazy, the bloke who got bit  must have been terrified but this is not the point I want to comment on. The poor dog only doing what it was clearly trained to do will most likely pay with its life. Just a question, should dog owners be physcologically  tested before getting large dogs? My view is yes and they should be licensed and inspected regularly like gun owners, first hint of trouble the animal is removed pending investigation.

Please be aware article below has a graphic picture.

http://www.stuff.co.nz/national/crime/10663753/Owner-orders-dog-to-attack-neighbour