My 10 year old Lab-chow used to bark loud, he tries to bark but he can't anymore. He scraches the side of his nose and is reverse and regular sneezing all day long. He is throwing up white thick stringy mucus and yellow stuff about 2 times a day. At night he is pretty good maybe a sneeze or 2. He is eating and drinking and is up and around, a bit depressed. It sometme looks like he can't swallow because the mucus in his throat is so thick. It has been going on for a month. The vet has not Idea. His blood work came back normal.