We have 4 adopted dogs (who are now "up in years") ranging from a 15 pound Pug to an 86 pound Lab. Needless to say, between the marking of territories and loss of functions, pee stains were an ongoing problem. We shampooed the carpets often and tried every product sold by pet stores, but nothing worked as well as My Pet Peed. It took me several applications - well, hello...4 dogs with issues! - but the stains disappeared! I cannot say enough about this product. As I refuse to get new carpets at this stage, My Pet Peed has allowed me to not be embarrassed when company comes. Thank you for an awesome product!