This is one of the common allegations that radical animal right groups often make against bullfighting and its promoters. The idea is of course to play into the common misconeption of the corrida being a fight between man and beast and an unfair one at that.

Bulls enter the ring completely untested. Indeed, to train them or acquaint them with the movements of the matador would be counterproductive and very dangerous to the bullfighters as bulls do pick up on the visual ruse played on them after a while.