Abstract: A pet door fluid/powder applicator device disposed upon the bottom of the flap of a typical pet door. The pet door fluid/powder applicator device includes at least one roller volubly disposed on an underside of a chamber. At least one interior cavity is disposed within the chamber. The cavity is configured to store fluid/powder in contact with a first portion of the roller. The fluid/powder is applied to the hide of an animal as the animal is caused to contact and rotate the at least one roller of the rollers. Thus, whenever the animal moves through the pet door, a dosage of the fluid/powder containing a desired active ingredient is applied to the animal.

Abstract: A self regulated feeder for a footbath for animals may include a hollow container for a source of fluid, an outlet passageway to connect the hollow container with the footbath, an air return passageway to connect the hollow container to ambient air to return air to the hollow container, and a differential valve to restrict the returning air to the hollow container. The fluid may include air, and the fluid may include a liquid having a disinfect agent. The self regulated feeder may include a flush passageway to flush the footbath, and the air return passageway may be connected to a liquid trap container to prevent fluid from the footbath from reaching the hollow container.