All these may be indicators that you have white grubs in your lawn. They are the larvae of various beetles such as European chafers, Japanese beetles and June beetles.
If you pull back the sod, you will find white, C-shaped, soft-bodied larvae with legs near the head. They feed on grass roots, causing sections of the lawn to die. They will turn into adult beetles and emerge from soil to mate and lay eggs, which then hatch into more grubs.
Skunks and raccoons consider the grubs tasty treats, so they pull up your sod to get at them.
Mid- to late August is the time to apply beneficial nematodes to control the grub problem. Irrigate the soil prior to application. Never apply nematodes in direct sunlight and water well for 10-14 days after the application.