It happened to me a couple weeks ago. This shepherd got close to my leg, and started barking. It was my fault, I was listening to my iPod. Anyway, he didn't actually bite. I stopped, and made him back down. I always make dogs back down, except ones that want to trot with me. Facing down two or three is harder than a single dog. Identify the alpha and make it back away, then the others will back away too. One time in Kauai there were these three Dobies. The owner was letting them run free. Dealing with them was a hassle. The only time I was bitten was by this little maltese at night protecting its dog-walking owner. I ignored it, and it attacked. It was just an ankle bite on my shoe.