They are called a Fila Brasileiro to be exact.
Why on god's green earth would you blame a dog that was bred by humans to be this way? Centuries ago when the world was much more rural and differnet then it was today, these dogs were admired by their couragesness, loyalty, and determination. They are to be respected for the service they have given to humans WHO MADE THEM IN THE FIRST PLACE!
If you were a woman in the counrty side and your husband left you with your kids and went to battle that dog would be your best friend, he would guard you with his life and die happily knowing he protected you and your family. I only wish humans had as much loyalty, courage, and honor as these dogs do!
Now that we live in a differnt day and age where their service isnt needed are we supposed to shun them? No the responsible thing would be to try and cleanse the line instead of exterminating them. The responsible thing would be to recognize how humans think they can play GOD and breed something to be made this way and then discard them because they are deemed vicious.