If you have been injured by a dog bite your first priority should be getting the medical attention you need. For mauling injuries call 911 immediately and follow the dispatcher's instructions until paramedics arrive.
Even if an ambulance is not required call a doctor or visit an emergency clinic. If a facial injury is involved the decisions you make immediately after the animal mauling can make a huge difference later on. For example requesting a plastic surgeon to do careful stitches can minimize scarring.