The answer to this question will depend on the type of hair your Yorkie has and the style of brush you use. Typically, you will want to use a soft, silicone hand mitt in the bath to help work the dog shampoo through and gently comb through without pulling or damaging the hair.  Many brushes are not ideal for brushing wet hair, so follow the manufacturer’s recommendations and be mindful of your pet’s comfort level in the bath.