Oh, I'm so sorry about your dog. My Lab X Sadie, 10 months, was diagnosed with blasto within 2 days, and was only found in her lungs too. Same signs your poor Oreo is showing. Sadie had Lyme disease first and was on doxycycline for 2 months, so she may have carried the blasto for some time before she started showing the signs, lameness, coughing, wheezing and the worst was she started not eating and throwing everything up.
Although my outcome with Sadie was a sad one, she faught the blasto for 2 weeks before finally passing on, we NEVER gave up hope. Always show your love and keep positive. This forum was a life saver for us during our time with blasto. It's been since September 16 since Sadie passed and its been really hard on my husband and I, but we realize now that we have to cherish all the time that Sadie did have for us.
The people on this forum are amazing, they KNOW and understand all the emotions you are going through. Lean on them. I did. And I keep checking up on everyone, because they became part of my family,even only by this forum.
Stay POSITIVE and good luck with Oreo. There are great stories of triumph on the site. Great advice too with doing everything you can for your puppy. Read all the posts. Keep us posted.CLS