My dogs pee on my lawn

I have a question:
My dogs pee on the lawn and I am getting brown patches in several places. I let them go out on their own in the yard so I have no control of where he goes. I have one male and one female.
Answer:
The quickest answer to give is to train your dog to go somewhere else. That's easier to say than to do.
The cheapest and often most effective way to reduce and stop the stains is to apply a heavy watering to the area. This dilutes the nitrogen that's contained in the dogt urine. If this doesn't work one of the local hardware stroes should be able to supply you with a neutralizing product. It's best to try water and retraining first.
Female dogs usually get the blame, but it's more to do with the way they urinate (squatting) than their sex. The stain causing nitrogen is the same in both sexes.