On human allergies, sinus rinsing works. Technical medical analysis: it clears the crap out of your sinuses. Once a day or at most twice.
(If you've never done this, you're probably remembering inhaling some water when you're swimming. It's not like that; the saline and bicarbonate make it not burn your tissues.)
Dogs: almost all the dogs I hear about have some kind of allergy. Mine was constantly licking his paws. There's a narrow-spectrum drug, Apoquel, that works for him.
