"The "grass scent" did a good job attracting my dog to stay on the pad. However, the membrane is more semipermeable than completely waterproof, so if you are unable to remove used pads quickly, or have an older pet on diurectics producing frequent and copious amounts of urine, they will leak thru to the surface below.
Look for sales and special offers on this product online and in the store, or constant use will be pricey."