The 
Dog Food Analysis is the impetus for my considering to change Katie's food.  I never knew that Royal Canin Yorkshire 28 is not a high quality product. 
As suggested in another thread, I contacted the companies listed in the 5 and 6 star ratings categories to obtain samples of their products.  I am waiting for the samples from those companies who have them available.  For those companies that do not offer samples, I can order 
Free Samples (10 max.) for shipping and handling only.  (Last selection in Browse Product Categories on far left.) 
I'll have all these different foods and understand that when changing foods you offer a little at a time with the original food.  So now what?  How do you think I should approach this? 
BTW, Happy Valentine's Day!  ♥♥♥♥