Dog pee includes different types of nitrogen that may burn your grass and result in yellowing. This often occurs when your pet goes in the same spot repeatedly. The answer? Dog Rocks! Basically, they get rid of the nitrates in your pet’s drinking water. Simply put them in your dog’s drinking bowl and they will remove Tin, Ammonia and Nitrates amongst others. By using Dog Rocks, your dog will have cleaner water and your lawn won’t have any more yellow spots. However, remember to change them after each two-month period.