Well we have had a bad turn of events. Stella has developed Pyometra (http://en.wikipedia.org/wiki/Pyometra) which we knew was a risk when we opted to not have her go through surgery to spay her. This infection may actually have been the reason for her recent lung issues, as her system might have been comprimised while trying to fight off the infection. We noticed a small amount of pus on the floor where she had been laying, about 4 weeks ago, and then nothing. However, shortly after her breathing issues got bad and she started antibiotics, the discharge got much worse and more frequent. Turns out it's a good thing it's coming out, otherwise it's much harder to diagnose until the dog is much sicker. So, long story short, she is scheduled for surgery tomorrow. We've been treating her breathing issues the past few days to try to ensure she is as strong as possible before surgery, and our great vets at Doc Side know how special she is, so we know she is in good hands. I'll post an update once she's through surgery and let you all know how she does.