Hi, and welcome to yorkietalk! I'm so glad you were able to get a yorkie rescue. Rescues can be very challenging at time, but they can also be extremely rewarding. Megansmama wrote a thread on rehabilitating a puppy mill dog, and even though your dog may have not come from a mill, she may share some of the same issues. Here's the thread:
http://www.yorkietalk.com/forums/yor...ll-rescue.html. She also might be able to help you with specific problems. Here's her page.
Megansmama