The Natrona County Fire Protection District was created in 1993 when county residents voted to separate firefighting duties from Natrona County government.
The Natrona County Fire Protection District assisted with the interior firefighting on one structure, and a U.S. Bureau of Land Management fire crew helped extinguish the wildland fire.
No human injuries were reported at a trailer fire west of Casper on Wednesday afternoon, but several dogs may be hurt, a Natrona County Fire Protection District spokesman said.