Thanks for the replies and encouragement. I don't know whether to take heart in Parker's response to the meds or not. Thus far today she doesn't seem any better or worse. She certainly has an appetite for rotisserie chicken and Fancy Feast though. And after reading some posts here I picked up on the fact the ithra. should be given with fat for easier absorption, so she gets that pill wrapped in a vanilla ice cream ball. She loves it.

I have only heard her cough once today which is an improvement.
Since we don't know if it is blasto, the way we are looking at it is: 1. if it is, we hope we have caught it early enough to kill off and we are feeding her what she wants to eat to keep up her strength if she does go through the "worse before it gets better" stage; 2. if it isn't and it is terminal, we want her to enjoy every minute, so for a Lab enjoy means food and we are trying to comply.
My vet prescribed prednisone in case there is inflammation. As I mentioned before, this is all new to her too. I had no idea it could feed the fungus. Should we discontinue? There is no inflammation so far. Where should I look for inflammation? I keep checking her gums to make sure they are pink as a way to check on the oxygen levels. She doesn't have noticeably laboured breathing so far.
I will explore how best we can test her positively for Blasto from Newfoundland next week.
In the meantime, do all dogs with Blasto get worse before getting better once on meds?
Thanks so much. Oh and if someone could point me to where I can see images of other dogs' lung x-rays with Blasto, that would be great. I read the first newsletter and copied it to my vet. This is an amazing resource!
Nicole