I've always loved big dogs. When I was little, I was bitten by a mid-size bulldog of some sort (I was 5, so the memory is a little hazy.) and I've been bitten by countless "small-fry" since. I try to be very cautious when dealing with them, as their moods seem to change faster than the wind. Their body launguage is harder to read, so I prefer the bigger guys, who "telegraph" their intentions a little better.
My brother has a demented little Mojo/Boston Terrier cross that is a complete spaz. He'll come over to you and beg for attention, then when you start petting him, he'll lick you for a minute or so, and then bite you....HARD.
Freaking spaz. *lol*