If you follow this link 
http://www.yorkietalk.com/forums/sea...archid=3310769 you will see we had a whole lot of trouble with Zoey. We have since been  giving her Geneflora       
Probiotics | Probiotic Formulas | Control Yeast & Candida  and have had very few problems with her. We feed her a raw diet, but there have been times when I have not been able to get that food. So durring these times we feed her a high quality no-grain food and she still does fine. I'm sure there are many of you with pets with similar issues, maybe the Geneflora would help. 
Take Care
Bob