We tried probably five different brands without any success until we tried this one. It appears that different brands/formulas could work fine for one dog but not another even though the ingredients seem to be the same. The first five brands did absolutely nothing with our female German Shepherd and the burn spots were destroying our lawn. After several months of trying one then moving on to another we finally purchased this one as a last attempt. After using this product for several days we caught our dog using the neighbor's lush green lawn and we panicked. We waited until the next morning to see if we needed to apologize or repair or make amends in some way, but the grass was as green as the day before without a sign of her being there. This works flawlessly for us.