"We have two medium size female dogs. The yellow spots were taking over our yard. After installing an in ground sprinkler system, we work hard to maintain our lawn. Sooo tired of liming and re-seeding patches several times a year. We have been using the tablets for 2 months now, and the spots are decreasing, alot! They aren't all gone but some might be from before, can't say for sure. Our dogs love the tablets, they sit and wait for them like treats. FYI, you have to give them per weight of the dog. Each morning our 30lb Border Collie gets 2, our 70lb Lab gets 4. The reviewer that saw no results doesn't mention the weight of his dog, but I would not be suprised if they were under-supplementing. I'm reordering more today."