This is more of a human-behavior-around-dogs rant than a dog rant, but my little cousin (11) was fixing to get her face bit off by Crystal.
Crystal loves kids, but she, like every dog in the world, does have a snapping point, and my cousin WOULD NOT understand that. She kept pulling on Crystal and messing with her when she had made it obvious that she wanted to be left alone. I told her repeatedly, "please don't pull on her, she doesn't like it," and other nice reminders until finally I got fed up and yelled, "if you don't stop you're gonna leave the house needing stitches!" She obeyed for about thirty seconds before following Crystal (who was eating dinner) and started standing over her and pushing her. Crystal then (luckily) air snapped and growled, and my cousin is so lucky she didn't get her face ripped off. She left her alone for about thirty minutes before messing with Crystal again. Luckily, they left before Crystal got too fed up again but Jeez, she needs to learn how to leave the poor dog alone.