Pit bull terriers are the meanest dog breeds ranked first in this list due to their scary look.
Rottweilers are often considered highly dangerous and aggressive dogs that look scary due to their aggressive temperament.
Strong and loyal dog breeds popular as guard dogs can be aggressive due to careless attitudes towards training.
The German shepherd is one of the most aggressive and dangerous dog breeds if their aggression and protective instinct are not correctly managed.
Chow chow dogs have a terrible reputation for being terrorists and aggressive, but the proper obedience training makes them the perfect canine companions.
Jack Russell terriers are also considered the meanest small dog breed as these small dogs are aggressive without proper training and socialization.
Chihuahua is the most aggressive small dogs with a bad reputation for biting due to neglected training.
Basenji is the last meanest dog, known as a hunting dog that tends to be aloof towards strangers with high training requirements.