Winnie is my Pembroke... She is not dog- or people-aggressive at all! She loves the dog park. If a bigger dog really starts beating on her during play, she will first try to hide under me, and then if the big dog keeps coming after her, she'll start getting defensive. She'll show her teeth, but never tries to bite. She'll never show her teeth unprovoked. She can take care of herself at the park.
She is pretty suspicious of new people. I bring her to school with me, and it took her a long time to really get up the courage to let people pet her. That probably has more to do with the fact that her previous owners kept her in an outdoor kennel all day than the fact that she's a corgi.
She is a clown, and very smart, which makes her mischevious at times. She loves to hide things, and she will ask me to play tug all day long. She loves little kids, but if anyone is running, she'll chase them- not nip, but chase. She'll also chase cars, squirrels, cats... anything moving.
She is a great dog, but is a handful!