Normally, Yorkie's ears are taped up very soon after birth to train the ear to stand. It makes the cartilidge in the ear grow that way and usually it is permanent once they reach a certain age. If your puppy's ears are no longer taped and are standing on their own...there is probably nothing you can do. However, if the puppy is still in the "taped ear" stage you could remove them and they might flop.