I have been told about 282727227 times that "Oh, he looks like a Silky!" about Jackson. I don't even care. He's 12.5lbs so people automatically think there's no way he could be a Yorkie. I have reason to believe he's probably mixed w/ Silky but I do think there's some Yorkie in there. I purchased him from a non-reputable breeder so he very well could be mixed with something else or simply a badly bred Yorkie. Either way, I love him the way that he is and wouldn't WANT a tiny little Yorkie. I would worry far too much. I like Jackson the way he is and wouldn't change a thing.
