My Chloe is almost 12 weeks and her vet told us the should stand on their own but I really like them up so I didnt want to take the chance so we taped them 2 days ago...took the tape off this morning and they are up already! One is a little loose still and will bond/flop over at times so I just put the tape back on but I would say by tomorrow night they will be set. If you really want them up, tape em.....just be sure to do it right because at first Chloes was bending backwards a tad....I guess from her moving and messig with it so when we took the tape off it looked like it had formed like that but after a few hours it stood normal.
I would shave the ears 1st though cause it pulls out hair
P.s...I think lots of yorkies do stand on their own...hers probabably would have eventully..