"Naturally" aggressive? No way! Confident little dogs, yes ... but not aggressive.
I've met sooo many Chihuahuas ... but only a SINGLE one that was aggressive!! It was a tan female short-coated named ChaCha; she belonged to my aunt when I was a little kid. ChaCha's behavior was entirely my aunt's fault. She babied that dog to the point of ridiculous, let the dog get away with anything and everything in the way of bad behavior, and just generally spoiled it rotten!!
ChaCha would growl, aggressively bark, snap, and sometimes bite ANYone ....
including my aunt who spoiled her so much! My mother refused to go anywhere near that dog and didn't want us kids near ChaCha either. (We had GSDs and terriers at home, and once a Rough Collie; NONE of them ever acted like ChaCha.) My father always thought it was such a shame that the entire family despised that dog because she was just so completely rotten!! He always said it was all
so unnecessary ... if only my aunt would have realized that ChaCha is a DOG, and trained her!!
Dad tried, and actually had success ... but then my aunt would always end up objecting, and never reinforced what Dad trained. She would say she didn't want her "baby" treated like "some DOG".
My aunt completely ignored the fact that ChaCha always responded
best to my Dad!! He was the only one ChaCha NEVER tried to bite, and that dog would specifically seek him out whenever he was at my aunt and uncle's home. Dogs are not "babies", but like human kids they really do WANT boundaries.
This is a misconception, and one that most responsible Chihuahua owners can NOT STAND to hear. Just like the bully breed people do not like stereotypes being passed down to their breeds, we would like to enjoy the same courtesy.
^^ Exactly!!
Every Chi owner I know has heard it SO many times: "Oh! A Chihuahua? Aren't they nasty little dogs?"