Dog Nostril Blocked. Your dog might sound like he/she has a stuffy nose because of a couple different reasons. In rarer instances, a foreign object (i.e.

While sinusitis is the inflammation of the lining of the sinuses or the nasal passage. If you give your dog a new food, medication or vaccine, you should keep an eye on them for a few days to ensure that an allergic reaction does not develop. If sinusitis has caused your dog to develop a runny nose, you'll want to keep it clean.