They are best used to protect single, prized specimen plants or objects. By far, the most common complaint from dog owners is brown urine spots on the lawn. You can dilute urine spots with water. Keep a hose or watering can handy, and flood the area after the dog urinates. Running the sprinkler system daily is no substitute.
Prevention is the key to dealing with brown spots.
Build fences around lawn areas to keep dogs out. Another approach is to train the dog to eliminate in a designated area, such as on concrete, mulch or rocks. Two additional problems are chewing and digging. You can help by providing them with stimulating chew toys, increasing their exercise and perhaps getting another dog. Other options include installing a low fence around a dug-up area.