What's the most ferocious dog in the world?

I was looking up some dogs for a kid in school and saw the description but no photo of a dog breed created to guard the diamond mines in South Africa. It was mixed with wolf, doberman, Belgian Shepard, bloodhound, rottweiler and some other breeds. Any help will be appreciated please.
Update: To clarify the question I want to know the breed and a website where I can look at the images.

Thank you.
14 answers 14