@ cslat1: Yes, I am VERY glad I found this forum! After going through a frustrated few days (which I can also blame on sleep deprivation) I've suddenly shaken myself up and taken a more patient attitude with Dora. And she is really loving in return. My favourite is when she climbs into my lap, which she sometimes does by jumping - and totally misjudging the distance, going facefirst into my leg!
@ Buster Brown: I think you are generally right about the love-not-fear thing, but I do want her to know I'm in charge. Could you suggest some strategies? When she's irritated or doesn't get what she wants, she often growls. I don't want her to do that, as I think she could scare others (e.g. children) when she's a bit bigger. Do you think she is trying to be dominant? I am trying to occasionally pin her gently (but firmly). When she does something I want, I praise her a lot. Sometimes, though, I get the sense she doesn't care or isn't paying attention to my praise. Is that normal?
@ PettasGrammy: Shih tsu? Schitzu?? LOL

Thanks for sharing how much you love your Yorkie. I'm getting lots of hope and support through this forum!