Update:
Nothing good to report. We are now about 5 weeks post-scope and a total of 3 months of drainage and he is still having lots of nasal drainage from one nostril. After the scope, he was given an extended script of Doxy and put on prednisone (in an attempt to reduce the inflammation). He showed brief improvement of lessened drainage, but then it returned to the copious amounts. It sometimes looks slightly pinkish or bloody, but often just looks like mucous. After completing the doxy script, we have him on a new antibiotic (blanking on the name currently). We also collected sample of drainage and sent to lab. Vet says that it came back as negative for fungal infection and not providing any helpful information.
Vet is recommending repeating the scope and flush. I have requested a referral to major clinic for CT and additional diagnostics. Vet sounds agreeable with this plan.
I think after realizing the licking was making his nose sore (insert sad face), the poor pup has taken to basically blowing out the drainage while awake. Although not important, you may imagine the state of my house. The prednisone has made him very hungry and thirsty, so hubby and I are trying to get home in the middle of the day to let him out more often.
At this point, it feels fairly discouraging to not even know what we are dealing with, let alone how to treat it. I assume we will have another long wait to get into the major clinic. Hopefully we will get some answers soon. Kicking myself for not just taking the time off of work, spending the money and taking him to the major clinic first.