Don't kid yourself Chihuahuas are like soccer balls with teeth. - they've been regarded as "ankle snappers," for as long as I can remember. They are so itty bitty that people are too embarrassed to "nudge(?)" them away to get teeth off their pants leg.
The lady on the corner had 3 but, I think the alpha female killed the other two. She'd let the mutt run loose and it would catch me on my walk home. The dog was seriously attached to the bottom of my jeans and the woman just continued to make small talk. All I was wishing for was for her to disappear so I could "deal with" the dog. She just didn't care. When she decided to go back inside she called the dog and it reluctantly let go - growling at me as it retreated.
I was just speechless. I have known that woman and her kids and husband for many years. She was always kind and thoughtful till that episode.
Then she got a Puggle - the dog started out fine till it learned from the Chihuahua that you are supposed to bark, growl , pursue and attack. Somehow the lady developed a vacuum between her ears.