The victim suffered back and neck injuries and was floating in and out of consciousness at the time of the incident, reports show.
Authorities were initially called to the scene by a 911 call from man who reported the victim had been trampled.
The caller reported the victim was “bleeding pretty bad,” the report shows. His condition was not available Friday.
The victim is not named in reports but is believed to have possessed an Oklahoma driver’s license.
It was not immediately clear if the bull somehow got loose from its pen to attack the man during the 6:30 p.m. Tuesday incident, or if the man was unloading his vehicle in the vicinity of the animal when he was injured.
A call to an official at the Live Oak County Auction Barn did not immediately yield any further detail.