It turns out the surveys found two small dog breeds, Chihuahuas and dachshunds, rated high
on aggression toward both humans and other animals.
Not exact matches
However as stated
on the AKC website a propensity to act aggressively
toward another animal has no correlation to
human aggression.
Obedient and intelligent, this breed is not born bad and their
aggression toward humans is largely dependent
on their upbringing.