My little Chihuahua is 8 weeks old and his ears are starting to perk up a bit (aren't standing up all the way yet) I almost wish they wouldn't - he looks so cute with floppy ears!
Anyway, how old is your puppy? Some take a long time to develop pointy ears - I've heard up to a year. I'm not really sure what is involved with "taping" ears but I'm sure someone else can help you.
Anna