an animal actuated spray apparatus for applying insecticide and other fluids to livestock . a rigid frame which is mounted to one side of an animal passageway includes two pairs of spray nozzles which receive fluid from a pressurized tank . the flow of fluid to the nozzles is controlled by normally closed valves which are selectively opened by an actuator arm tripped when an animal moves through the passageway . the nozzles are arranged and controlled such that one pair of nozzles sprays one side of an animal moving in one direction and the other pair of nozzles sprays the other side of the animal upon return through the passageway in the opposite direction .