She’s very excitable and barks loudly and rapid-fire and it takes basically nothing to set her off. It’s loud enough to give me a headache through a closed door, and from my perspective the barking fits come more or less at random. Not helping things is that my family thinks it’s hilarious to get her riled up and does it constantly 
But if you say you don’t like dogs, people act like there is something wrong with you and assume you must be a bad person 
I know a family with the exact same type of dog, completely untrained borderline feral jack russell who barks constantly and snarls at anyone who makes eye contact and even threatened to bite of my fingers…
And the family just thought it was funny to wind the dog up into barking and growling fits i felt like I’d entered hell.
Contrary a friend had these chihuahuas which were little gremlins but never really barked more just snort and grunt but i loved them dearly they were very sweet.