This comes as no surprise to me, but may to others: The most “aggressive” breed of dog? The Dachshund. Followed by chihuahua’s, then jack russells.
As someone who suffers from “little dog syndrome” herself, this is to be expected. We have to prove that we’re big and tough by being overly feisty and aggressive. Or at least, that’s my excuse for being bitchy: I’m short. What’s yours?