What a great thing you did in her rescue. Sometimes, with rescues we so love, care, and give attention to them we unknowingly encourage the dominent behavior. the HSUS has tips on what to do, basicly the same as what's been posted and incl. nothing in life is free. (I agree with the suggestions the posters give.) This will provide more info.

http://www.hsus.org/pets/pet_care/ou...nant-Dogs.html

You may have a dominance issue with your dog if:

He resists obeying commands that he knows well.
He won't move out of your way when required.
He nudges your hand, takes you're arm in his mouth or insists on being petted or played with (in other words, ordering you to obey him).