I have 2 tiny dogs (4 lbs) they were adopted. They are now elderly, so have accidents. I have wee pads all over my house, wash them 3 times a week, but my house still "smelled". I heard about your product from a lady that has 2 cats. Bought some, now having 1 sent to my home monthly, love them. They help keep down the odor, and I can breathe easier. I have COPD. I would love to change my filter twice a month but can't afford it, so monthly is all I can do......Jo