We went through this with the dobie in my avatar when she was a puppy. Have you taken her to puppy training yet? I was taking China to puppy training at night to socialize her and teach her good puppy manners. The trainer came to our house to show us the choke chain method that MellieK mentiond because I was afraid I would hurt her and wanted an expert to teach me the right way to do it. It worked in the first session!! I can't remember now exactly how it was done.