 In 1971, Webb hoped to win the World Grand Championship with another horse, but was prevented from entering the Tennessee Walking Horse National Celebration at all by an outbreak of Venezuelan equine encephalitis virus.The virus caused a quarantine to be put in place, blocking horses from Arkansas and several other states from going into Tennessee, where the Celebration is held.In 1978, Mark of Carbon, Webb's third World Grand Champion, beat 15 other horses to win the stake.