I posted asking a similar question not to long ago and this is the thread:
http://www.yorkietalk.com/forums/yor...in-weight.html
I switched to Natures Variety Frozen Raw Medallions recently and that has helped so much. My Baci is now a healthy weight- and so much more cuddleable now that he's not so boney. There were many good suggestions YTers offered me in the abive thread that you may find helpful.
Good luck!