I've only really been bitten once, by a miniature schnauzer. It wasn't a serious bite, I was reaching down to pick something up off the floor at a friend's house and the dog suddenly snapped and bit my hand, breaking the skin and leaving a small scar. It seemed like a territorial thing. My mom's friend had a West Highland white terrier that nipped at my feet when I got close to her food dish but never broke skin.

A dog that looked like a black lab mix tried to bite me when I was younger. I was on my front porch, and saw it trotting down the street and called to it, and it broke into a run snarling at me. I got back in the door of my house and it attacked and bit the corner of the screen door as I was pulling it shut.

A friend's sister's sheltie snarled and bared her teeth at me but I looked down and sat still, and they put her in another room. An australian shepherd looking dog once followed me down the street hackles raised and snarling, frightened me but I just kept walking and it didn't attack.

That's about all I can think of at the moment.