Under normal circumstances, dogs should be able to breathe smoothly. If the dog's nose is blocked at home, it may be caused by the following reasons: 1. Changes in the outside weather, the dog's nose is blocked due to a cold, 2. The presence of foreign matter in the dog's nose , causing difficulty in exhalation. 3. The dog is exposed to pungent odors, causing nose discomfort. Breeders can provide targeted treatment for dogs based on the above reasons.