Abstract: This invention relates to the art and science of spraying pet animals with pesticides automatically as a pet animal passes through an access device of this invention. An embodiment of this invention comprises a reservoir of pesticide connected to an animal access device such as a cat flap via a plurality of conduits and spray nozzles located on the aperture of the access device. The system incorporates a battery powered pump and a timer to control the quantity and the times during which the pesticide will be dispensed upon detecting the presence of a pet.