I have a big house and a two dogs. I bought this to reduce the wet-dog-after-rain aroma that can linger about. It has a nice scent, and I believe it made my carpet somewhat fluffier after using it. I can't speak to whether the allergens in the room were reduced (how would one measure that, anyway?), but I sprinkled this about and let it sit for around an hour, and it did cure the wet-dog scent we all dread. I'll be ordering it again, to be sure I have it around.