Sometimes Mother Nature and man's best friend are not the culprit with regard to bald spots on your lawn. Human error can cause bald spots, too. Dull mower blades or grass that is cut too low can cause bald spots. Fortunately, this is easily remedied.
To avoid bald spots, make sure mower blades are sharpened at the beginning of each mowing season, as dull blades damage the grass, which is then forced to use valuable nutrients to treat torn grass, weakening the lawn over time. When mowing, make sure you're not cutting too low so the soil can retain as much moisture as possible. This will necessitate more frequent mowing, but this, too, can prevent bald spots, as it ensures those parts of the grass that contain chlorophyll will not be removed.
Bald spots can turn a pristine lawn into an eyesore. But treating bald spots can be easy and, when done effectively, the lawn can be restored quickly.