I have 2 Yorkies. One has floppy tipped ears that never stood no matter what I did (Rubbing, taping, shaving, taping with popsicle sticks) and the other has ears that have been held erect with no help from me at all when she was 9 weeks or so.....One day her ear would flop and stand the next day and the other ear would flop. Then both of them stood...Just genetics at work.........