Originally posted by Sus
Well, there it is! I'm glad you asked this question. And by the way - what on earth is a pet peeve???
I've always thought it maybe came from the word petty, because they usually are. It's usually things that consistently bug you....I'll look it up and see if I can find anything that might explain it better. Your english sounds fine to me!

From www.dictionary.com

Something about which one frequently complains; a particular personal vexation

A particular or recurring source of irritation

n : an opportunity for complaint that is seldom missed; "grammatical mistakes are his pet peeve"

I'll try to find the origin later, unless someone else finds it first...