A. Dogs can definitely get allergies to things in the air, so the sneezing, itchiness and red eye could be caused by that. They can also "snork" stuff up their noses - I've seen dogs do it with kibble, believe it or not - that then get stuck above the soft palate and cause violent sneezing attacks. Plant material can get inhaled and stuck as well.
Dogs can also get chronic rhinitis (inflammation of the nasal passages) due to infectious (viruses, bacteria, even parasites) causes or immune-mediated causes. Your vet should be able to tell you more after an exam and some testing. She may benefit from anti-histamines or other drugs, but it's important to figure out the cause so that appropriate treatment can be determined.
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