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A dog's urine is very hard on grass. It can leave eight to 12 inch round circles of dead grass on your lawn. These dead patches are known as "dog spots."
The only way to prevent dog spots is to water down the area where dogs have urinated. The water will dilute the urine so it will not kill your grass.
The only way to truly keep dogs from using your lawn as their restroom is to install a fence or motion detectors. Motion detectors can be purchased at pet stores. They will put out a sound when a dog comes into your yard that will drive him or her away.