Remember, they're innocent until proven guilty.
Dogs are animals and have animal instincts. They need to have those acknowledged and respected. They are not Disney cartoons. They are not The Lion King. You do not take dogs whose background you know nothing about, particularly big, powerful dogs like Rottweilers, and put them around your small children. It is just stupidity and now a little boy has paid the ultimate, terrifying and bloody price. The man ought to be charged with negligence. He is an utter fool and the damage he has caused is irreparable.