The Ada County Sheriff's Office says that the crash happened on Amity Road between Meridian Road and Locust Grove Road.
The sheriff's office says one man was taken to the hospital with serious injuries.
Deputies say the man had apparently walked into the road to pick up his cat when he was hit. There were no street lights in that area, and investigators say it was dark when the crash happened.
Amity Road was closed for about about three hours while deputies investigated. They believe the dark conditions may have played the biggest factor.