If your dog sneezes frequently and irregularly, it may be caused by allergies, upper respiratory tract infections and other diseases.
Care Hacks
Why does my dog keep sneezing?

There are many reasons why dogs sneeze. If your dog suddenly sneezes continuously, but it subsides after a period of time, it may be caused by inhaling dust, cold air, etc., and sneezing caused by such reasons generally does not cause other symptoms.