If you think it's ok to feed your Yorkie food with cereal grains (corn, wheat, etc) please read this article from the latest online issue of Petfood Industry Magazine:
Mycotoxins contaminate cereal grains worldwide, and their presence in petfood threatens the health of companion animals. Grain processing, sampling error, analytical methods, conjugated mycotoxins, storage conditions and synergistic interactions are common challenges faced by the petfood industry.
The full study can be found online by clicking here.
http://pubs.acs.org/cgi-bin/sample.c...jf062363+.html
This was the reason approximately 100 dogs died not long ago, and that pet food manufacturer still uses grains in their foods.
Protect your baby, read the label!