Staffordshire Terrier
The Staffordshire Terrier is very visually similar to that of a Pit Bull. Though they may look like Pit Bulls, this breed is actually known to be very friendly to humans, but proper training is of course crucial. But, similarly to Pit Bulls, they have been bred as fighting dogs over the years, making them a risky pet.
Japanese Tosa
This rare breed is banned in a dozen different countries from being owned as pets. They were originally bred in Japan as fighting dogs. Interestingly enough, they are known to show aggression toward both humans and other animals. They are both bold and fearless, their large size making them difficult to control once an attack begins.