As with humans, dogs can get seasonal allergies, and pollen is often the main culprit – particularly during summer due to flowers blooming and bees pollinating. 
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I’ve taken care of dogs that were on allergy medication.
Yup, I’ve sat dogs with allergies. They took pills daily in their meals or covered in peanut butter or cream cheese.
My dog’s nose runs sometimes during spring, though not often enough to warrant medication.
Yep! My dog and I seem to suffer from it at the same time from time to time. Whenever the pollen is high, we keep our walks short. He doesn’t need to take as many meds as I do, but the poor thing gets very watery eyes and sneezes quite a bit, too.