This poor little girl. What a tragic, senseless loss of a young life. No matter what your opinions are of these breeds like Pit Bulls, what parent or guardian leaves their children alone with a dog like this? If I had a child I would not leave them alone with a Toy Poodle.
The fact is, that the people - mainly men who own Pit Bulls, Mastiffs and the like are complete t**sers. I would get this man who owned the dog and put him alone with a spotted Hyena and see how long he lasts! This little girl did not ask to be left alone with the dog. She had no choice and no chance. God bless her.
I don't think there is any need for Pit Bull Terriers to exist. Mastiffs should just be used as guard dogs, not pets. I draw the line with Rotweillers and Dobermanns. Trained correctly in the right family they can make good pets - but even then, care should be taken when they are near children.