Dogs have mucus for the same reason humans do. to coat their nasal passages to breathe more clearly and also to coat their stomachs to make sure that the highly acidic stomach acid of their stomachs doesn't burn a hole through their stomachs.
If Spot is sneezing and has a stuffy nose, he's likely suffering from canine congestion. Just like people, dogs can develop excess mucus in their respiratory tract due to a variety of reasons ranging from Allergies to respiratory infections.
Dogs can get colds call vet to see what you can get to dry it up
Do you know what the dog ate previiously? any carrots or fruit? if it continues take stool sample to vet.
Probably a respiratory infection
Splurging sperm from his wang.
foods that aren't healthy for the dog such as grapes garlic etc.
mucus causes green saliva>
Infection.
Ploysinusitis is the simultaneous inflammation of multiple sinuses. What causes this is that mucus gland gets blocked, but the gland keeps making mucus and cannot drain out. The mucus will then stretch the gland and creating a mucus filled cyst.
Mucus
Drinking lots of liquid does not help get rid of a cold. Drinking lots of water will help prevent dehydration and reduce mucus. Water helps keep mucus thin and easier for your body to get rid of it.
Some mucus in the stool is normal. Conditions like irritable bowel syndrome and ulcerative colitis can cause more mucus in the stool.
Sexual arousal
It could be anything from too many fats in the dog's diet, to have a bit of an intestinal problem (we all get them). Even humans can have a certain amount of mucus in their stools. If your dog's stools are quite white with mucus then it's advisable to take a stool sample to your vets for analysis to be sure there is no infection.
it causes unusually thick mucus in the pancreas
Mucus (snot).
Cystic Fibrosis