Inhaled through a nostril they can cause excessive sneezing and bloody discharge from the nose. (clearlakevetclinic.com)
It can also be caused by excessive sneezing, which will result in a temporary condition. (dog-health-guide.org)
Dogs who are suffering from allergies often exhibit symptoms such as excessive itching (scratching, rubbing their bodies against furniture or other objects, gnawing at their paws or other parts of their skin, etc), red skin, scabs, runny eyes, excessive sneezing, and increased ear infections. (petconsider.com)