This situation may be caused by factors such as foreign bodies in the nasal cavity and colds. Foreign matter such as hair, dust, pollen, air freshener, perfume, etc. enters the dog's nasal cavity, irritating the nasal cavity and causing a popping sound in the dog's nose. It is recommended to remove the foreign matter and open windows for ventilation. Dogs are in a good mental state when they catch a cold in the early stages of a cold, but will have symptoms such as sneezing and increased nasal secretions. It is recommended that the dog be kept warm and given an appropriate amount of pet-specific cold medicine.