Chicken may have more water in it than chicken by-product but ANYTHING can be in chicken by-product. Byproducts consist of anything BUT the quality cuts of meat and highest quality edible offal used for human consumption.
I know how difficult it is to find a food for your furbaby. They definetly recieve the pickiest eater award

. You finally have to decide what is right for YOU and YOURS.
I would suggest you research quality ingredients and ingredients to avoid. This will help you decide what YOU think is healthy for your Yorkie. I like to review websites for companies but keep in mind they are trying to sell thier product.

I have refered to the website
THE DOG FOOD PROJECT at
The Dog Food Project - Identifying better products many times in my continual search for quality food for Maddie.