Remove overhanging branches to cut off easy access. You can also place an 18-inch cylinder of sheet metal around the tree trunks at least 3 feet above the ground. Make sure garbage and trash containers have tight-fitting lids and are clasped or tied to keep raccoons from tipping them over. Do not leave pet food outside. If you have a pet door, do not leave food out on the floor or counters at night.
Occasional problems do occur with prairie rattlesnakes.
Rattlesnakes have elliptical pupils, distinctive heat-sensing pits on each side of their face, and rattles on their tail. In rattlesnake areas, keep firewood in a covered box. Do not landscape with expanses of large rocks, especially in open sunny areas. Mow weeds and vegetation and remove rocks, boards and debris. Reduce the rodent population on your property to reduce a major food source for snakes.