Cats may sneeze due to irritants like dust, pollen, smoke, or foreign objects, as well as respiratory allergies, viruses, or bacterial infections. Dental problems can also cause sneezing because infected teeth roots lie near the nasal cavity.
Infrequent sneezing isn’t harmful, but persistent sneezing accompanied by other symptoms like discharge from the eyes or nose, lack of energy, or reduced appetite may indicate possible health problems. If you notice these signs, talk to your vet right away.