PetiGreen improves the environment of the soil so a larger population of microbes than the soil can normally support can survive. When the population of microbes reaches a large enough size they can process the excess nitrogen from the dog urine more rapidly than the nitrogen can kill the lawn. It takes time to reach a population that will prevent dog urine spots in grass but as you are using PetiGreen and the population is growing it can become big enough in just a few weeks that it can process enough nitrogen from the grass that new seed will usually germinate and start fill in the burn spots. Eventually the soil environment improves and the microbial population increases enough that the nitrogen can be processed before it has a chance to damage the grass.
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