A tractor trailer carrying 42,000 lbs. of dog food overturned Thursday about 1:50 p.m. on Route B near St. Thomas.Chris Champlain, 33 Henley, was driving the truck from the Diamond Dog Food factory in Meta. According to the Missouri State Highway Patrol, the accident occurred when Champlain crossed the centerline, overcorrected, and ran off the right side of the highway before overturning.