Some Yorkies are okay with human shampoo, but I recommend using a shampoo that is formulated for dogs. There is a different pH balance, and a really good one will have gentler ingredients.
Be sure to rinse out shampoo really well. Leftover shampoo residue is drying and can cause flaking. Follow up with a conditioner.
Having a short haircut can also expose Yorkie skin more to the impact of weather and your home environment. If it is cold where you live and you are heating your home, that can contribute to dry skin. During the warmer months, be careful of sunburn.
__________________ Kristin, Max and Teddy |