The meanest looking dog or most fierce looking dog has to be without a doubt the Pitbull (aka: American Pit Bull Terrier, American Bull Terrier, American Staffordshire Terrier, Brindle Bulldogs, Bull and Terrier, Bulldogs, Half and Halfs, Old Family Dogs, Pit Bull Terriers, Pit Dogs, Pit Terriers, Rebel Terrier, Staffordshire Fighting Dogs, Staffordshire Terriers and Yankee Terriers)
A pit bull is a fearless dog that will take on any opponent. They will lock their jaws onto the prey until it’s dead. Pit bulls have a reputation of mauling people to death and they are highly sought for dog fighting.
However, any dog can be vicious due to many factors. Inbreeding, breeding to fight, and abuse are just a few. A dog that was bred to fight has a chance to produce vicous offspring. The same dog may also produce very calm, very loving offspring. Inbreeding and abuse are more likely to produce a vicious dog of any breed.