All Yorkies are born with folded ears that should eventually stand upright. During the first three months of life the ears gradually unfold,but sometimes they need a little taping to get to the prick eared position that is standard for a Yorkie's appearance. They also need to be shaved in order to remove the weight of the hair, which can easily keep them down.
The taping instructions given here are quoted directly from my first Yorkie guru, the late great Terri Shumsky of Vassar Square Yorkshire Terriers. Terri raised Yorkies for 31 years, during which she finished 37 homebred champions.
Once the ears are up, all you need to do to keep your Yorkie looking sharp (and like a Yorkie) is to keep the hair shaved off the upper third of the ear. This is best done with an inexpensive Wahl Tidbit clipper, available online from most vet and pet suppliers, or in a pinch, you can use a simple electric mustache trimmer which can be found at any chain drugstore.
Last Vassar Square Yorkie litter