Will definitely keep you guys updated, thanks for the help. Here are my main thoughts on this, now that I've settled down:

Patrick is more upset about this than I am. (Mind you, I'm a bit disappointed, but still) After his initial rage, he got dejected because now he feels like his present is ruined. So, I'll tell you guys what I told him: she is beautiful, she is sweet, she has some sass (she threw a tantrum earlier today), and while she is not a purebred, I bet she'll still get big anyway. She's a mutt, and that's okay. Her name is Serendipity, which means something that happens by chance that is fortuitous. Now, is she perfect to what was desired? No. Do I love her anyway? Yes. Serendipity. Not ideal at first, but lucky still.

Now. That being said: I do want some sort of acknowledgement and/or atonement to this issue from the seller. But.. could be worse. And I'm certainly not sending Dippy back now. More I handle her, the more I love her. Besides.. I've already invested in her mite treatment.