If you use the cup method here is a little secret aide for you. Buy large men’s tube socks, cut them up the middle leaving approximately 5 inches at the toe. Put the toe part over the cup using the dangling pieces to tie around the puppies’ necks. It looks like a little bonnet and acts as a buffer against dirt and flies getting at the cut edge of the ear. This allows the puppies to play with each other without any damage to their ears.
courtesy of Carolyn Irvine, Royolyn, Canada