ok, I just read that a yorkie's ears should begin standing at 6-8 weeks. My Yorkie is 7 weeks, and her ears are not lifting. When should I start to worry about it as a problem? (And yes, I realize that she shouldn't have been given to me until 12 wks, but I didn't know that until I had already gotten her!) And if I need to tape, what kind of tape do I use, and do I leave it on all the time?