Dark green patches on lawn

I have many darker green patches about 1 foot wide all over my back yard and a few in my front. These patches have grass that looks healthy but it grows much faster than the rest of my lawn. There is no dead grass or brown grass just dark green patches that have seemed to multiply on my lawn. I first thought this may be due to our new female retriever and the nitrogen in her urine but I have also seen this in the front yard and on a boulavard down the street. Any ideas?
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If not your dog, probably other dogs or other animals in the area.
Sounds like classic signs of a dog relieving him/herself.
--James--
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I was sure of it too except I have it in my front yard which is not accesible to the dog or other dogs in the area.

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Do you like in a newer sub division? (10 years or lees)

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Man I hacked that up while my Basset Hound was trying to play lap dog.
Do you live in a newer sub-division?
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No its about 20 years old.
wrote:

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Too many stupid answers to one decent question.
The green patches are not from dog urine (that kills the grass and turns it brown). There's a high nitrogen content in the soil underneath the grass. What you have are earthworms giving castings (earthworm poop) to the soil underneath which enriches the soil. To encourage more earthworms in the nearby grass, try a cheap solution to increase their population (works also in garden beds). If you or someone near you drinks coffee, save the coffee grounds (not the filter paper!) and sprinkle these around the darker green patches. When the earthworms emerge at night, they'll consume the grounds and begin tunneling in the soil nearby. Works great.

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Wouldnt fertilizing the grass with enough N provide similiar results. The reason I ask is because I have fertilized throughout the spring and summer and have also aerated the lawn. Eventhough there may be castings the additional N in the soil shouldnt be so noticable...or so I thought.

down
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