Some Yorkie's ears stand up and some don't. Sometimes it has to do with how much hair they have on the back of their ears (that's why some people trim it to get the ears to stand up. I have a 9 month old Yorkie name Riley. His ears stand straight up. Occassionally, one ear will fall down so he has one up and one down. LOL I also have a 3 months old Yorkie TJ and his ears flop. He has so much hair on the back of his ears, I don't think they will ever stand up! It doesn't matter to me. I like the ears either way.
#1 Riley
#2 TJ