The first Pitbull, a breed of dog designed specifically for fighting, originated in the 19th century. It was mainly bred from American Stafford Terriers and American Bulldogs. Pitbulls have strong endurance and bite force, can withstand 80 kg of pressure per square centimeter**, and have pain sensory nerves.
The second place is the pastoral native Tibetan mastiff, the native Tibetan mastiff is a real guardian of the plateau, living in the first pastoral area. They don't have gorgeous colors and skeleton front pages, but they are the spirit of the plateau.
The third is that the Rottweiler is an animal of the canine genus, with a strong body, fast movements, and strong momentum, and is one of the most courageous and powerful dog breeds in the world. This breed was once used to guard cattle and is an intelligent, strong, and approachable dog breed.
The fourth is that the Caucasian dog is a large dog breed that is usually used to guard and guard families. This breed of dog is extremely hostile and aggressive towards strangers, needs the command of its owner and is very loyal.
The fifth is the Argentine Dogo Terrier, a dog breed bred in South America, originating in the province of Corvador in the central region of Argentina. The Dogo is large in size, muscular, and stands out for physical strength and endurance, making it an ideal choice for lovers of fighting dog organizations.
The sixth is the Italian guard dog, also known as the Kasro dog, which is a large fierce dog with the explosive power and endurance of a mastiff and is trained to be an excellent guard dog. Native to Italy, the breed is used to drive cattle to slaughterhouses, hunt large wild animals, and guard their owners.
The Seventh is the Japanese Tosa, which is a medium-sized dog breed native to Japan. It was first discovered in the Tosa region of Japan and is a dog breed that can hunt wild boars. The Tosa Inu is a highly aggressive dog breed that is extremely combative and can even hunt a wild boar. 
The eighth is that the Central Asian Shepherd Dog is an ancient breed with a history of more than 4,000 years and may be a descendant of the Asian mastiff. This fearless sheepdog has been used as a guard dog for sheep for hundreds or thousands of years.
The ninth is the Neupolitan dog, a fierce dog originating from the Campania region of central Italy, probably originating from Roman fighting dogs, military dogs, and circus dogs, and was introduced from Alexandria from Asia via Greece. This dog is one of the most feared dogs in the world, because once it attacks, it is not dead, and it likes to devour the prey it kills, including people!Known as the most brutal killer in the fierce dog world.
The tenth is that the Brazilian Mastiff is a strong and powerful mastiff, one of the two native breeds of Brazil and the national dog of Brazil. 