I have a cat that has a marking problem. We've tried for a year (working with our vet) to change his behavior. Unfortunately we're likely going to need to rehome him, which is devastating. I've tried so many products (Jackson Galaxy, PetOxy, Nature's Miracle, My Pet Peed) and while they all work in some capacity, this product seems to work faster, without work, and it lasts. I've already gone through an entire bottle and will probably buy it again.