What are the guard dogs?

The guard dog belongs to the canine family, Canis lupus, and is fierce, being a dog with a powerful bite, swift attacking speed and precise attacking ability. The first requirement for a guard dog is fierceness and lethality. For example:Rottweiler, Tibetan Mastiff, Stafford, Bull Terrier, Tosa, Feller, Old English Mastiff, Italian Mastiff, Argentine Dugong, French Mastiff, South African Mastiff, Pit, etc.