The owner of a Murfreesboro walking horse training stable says allegations of soring are unfounded and he has independent veterinary proof clearing his business from all allegations. The Humane Society of The United States says it has secretly recorded video showing trainers at Thorsport Farm using caustic chemicals on the animals hooves to help produce the “big lick” gait enjoyed by fans. But the Tennessean reports Duke Thorson says 3 independent vets examined 3 horses in question, and found them all to be healthy and free from soring. The 3 horses are set to show in the Tennessee Walking Horse National Celebration beginning this weekend in Shelbyville. The soring allegations under investigation by Rutherford County authorities and the US Department of Agriculture.