Quote:
Originally Posted by dog friendly
Like I have said before, this is sand not real dirt. The pee goes right on down, with no yellow spots. You could have grubs if you have yellow spots......
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It is my understanding that animal urine can cause some spotting if the grass is fully fertilized and the nitrogen in the urine causes the grass to have excessive nitrogen. If the grass is low on nitrogen then the urine will cause it go grow more rapidly and greener than the surrounding grass.