Dr Bruce Whittaker in Newport Beach, close to city of Orange, also does great work with Yorkies: I was referred to him by a yorkie breeder, and she loves him, here is what I have in my database:
1)
http://www.nhahvet.com/site/page.php?6 Dr. Bruce Whitaker D.V.M. 2670 San Miguel Drive
Newport Beach, CA 92660 949 759 1911