Hi Cajun,
I would go back to the vet and ask for a thyroid panel.. If the levels are normal then it is proabably dietary.
I would suggest the links below for info for possible diet.
http://www.yorkietalk.com/forums/sho...62&postcount=3 http://www.yorkietalk.com/forums/sho...74&postcount=8
Cheers,
Deborah