Your little puppy needs time to adjust to his new home. It is not uncommon for a Yorkie pup to not want to eat when there is a big change . I am glad you have the nutri cal handy. yorkies are known to be picky eaters too. Try a little cheese , yogurt, boild chicken no skin , and mix it in his food. When you can buy a pre. more nutritious food . The two foods he is now eating are of low quality.