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Hello.. Thanks for the question.
I'm worried about a nasal tumor in your dog. These are fairly common tumors that will cause nasal congestion, discharge and eventually death as they invade the bone and brain.
This may just be an infection, but the lack of air flow makes me worry more about a true mass effect. To diagnose these, we need to scope the nose (rhinoscopy) and do a CT scan of the head. If it's a fungla infection, an anti-fungal is done at the same time. If it's a tumor, then the options are limited. Radiation therapy is the best way to shrink them down.
If it's just a bacterial infection, then some antibiotics +/- steroids may help to decrease the inflammation and get things under control.
I hope this helps, let me know if you have any other questions.