5. Rottweiler
Rottweilers have killed lots of people. The data gathered in the late 1990’s are very alarming. These dogs are strong and their bite is more harmful than that of any other breed.
6. Fila Brasiliero
This species is also called the Brazilian Mastiff. It is famous for unique tracking skills. However, the dog is incredibly aggressive. It is not easy to control the Brazilian Mastiff. There is a list of countries where this species is banned.