My boyfriend is severely allergic to dogs. We have to big dogs, and he used to sneez and cough all day long. He had trouble sleeping and breathing almost everyday without medication. After using this, he no longer takes allergy meds, and has a much easier time breathing and I definitely helps with the smell. This product is great!! And the color indicator is just a cherry on top. I did have some trouble navigating the website, and trying to change subscription frequency, but other than that, I c...