A stray dog caused an eight-vehicle collision on a Florida highway early Friday. The overnight wreck left three people with minor injuries, and shut down all westbound traffic on the I-10 in Jefferson County, Florida Highway Patrol said. The accident began when a sedan hit a dog, rendering the car QUOTE "inoperable" in the middle of the highway, the Tallahassee Democrat reports. A second sedan crashed into that vehicle, then a semi-tractor smashed into both cars and a concrete barrier wall. Debris reportedly scattered across the highway and impacted six other vehicles. A Florida Highway Patrol sergeant said the stray dog was killed in the crash. He did not know its breed.