I would take the dog to the vet ASAP. It sounds like something is in the nasal passages or worse. Did the dog eat any chicken bones? Something could have splintered off. The vet may take xrays or examine for a foreign object.
I had adopted a German Shepard temporarily. My dog Scooby who is a Jack Russel/Beagle mix did NOT get along with the HUGE German Shepard. They had gotten into several fights. Luckily, she was pretty gentle with him in the fights. She had lived around smaller dogs most of her life.
Well, luck would have it... I had decided to have my first "Open house" after moving into a "new" home. It had NEW carpeting in the living room and the stair well. Scooby and the Shepard got into a knock down drag out fight. Scooby is partially paralyzed and should know better!!! So I was forced to separate the 2 dogs immediately. I tossed Scooby into a bedroom and kept the German Shepard out. (Ain't no way I am messing with a German Shepard) I walked down the stairs and noticed blood EVERYWHERE!!! ALL over the stairs and on my new carpet! It looked like a murder had taken place !!!
I panicked and ran back up the stair to check on Scooby. He was fine and NO blood! I then take a look at the Shepard... There is a bunch of blood coming from her nose!!! Scooby had bloodied the Shepard's nose!!!!
I quickly applied a cloth and got the bleeding to stop. It was too late for the carpet... I had to spend the rest of night trying to steam clean blood out of the stair way and living room. It took forever to get them out! I still had huge blotches of blood stains for weeks.