This claims to work by lowering the pH of dog urine. I don't know exactly how it works, I just know that is does. It has made a big difference in the look of my yard!
I used it 5 years ago for my former pets and both dogs took it out of my hand like a treat. It was very palatable and worked very well. I ordered it again for my 2 new puppies. Fast delivery (3 days)! Still palatable and effective on the lawn!
It definetly makes a difference. The spots where they pee still get some brown but nothing like the big bare spots the pee used to make.