Unfortunately, many people walk their dogs on the first lawn that they can find. While this isn’t the dog’s fault, chemicals in their urine can cause the grass in the affected areas to die off. If you see a dog walker on your lawn, try to find out who they are and politely advise them that they are trespassing on private property and causing damage to your lawn. Let them know that they’ll receive a bill from you as a result of any repairs you need to make. Most accidental offenders will steer clear of your lawn in the future.