[eskimosik]

It's happening because you let it happen.

You need to be a lot firmer in telling people that your dog is not friendly and that they shouldn't pet her. Use a firm, loud voice and tell them to stay back.

I was having a problem with people letting their dogs approach Amy until I started being VERY firm and loud with them and grabbing Amy to pull her away. Get between the dog and the person. Don't allow them access and be loud.

I've also found that using a metal prong collar or chain makes people really wary of dogs. I would never approach a dog on a chain, and when I was training Amy with her prong collar people kept a huge distance from us.