Whoa...you might be onto something with the dorkie...I found this on google images and she sure looks a LOT like this dog (a dorkie).
http://puppyer.com/img/other_dogs/dorkie_592_15.jpg
[Edit/Update] She just went into the bedroom to lay by Bella's playpen...aghh...no we cannot keep this poopsie..no no and no. lol She really has umm...how shall I say this? Large teets. I'm wondering if she has had puppies recently? =/ I would have no way of knowing. She sure is being very protective and hovering over Bella though so it makes me curious. I'm guessing the vet could tell me in the morning. :]