Abstract: A chemical applicator for a pet door includes a substantially wedge shaped body defining a chemical reservoir therebetween. The wedge shaped body presents a ramped transition between the surface of the pet door above the chemical applicator and the front of the chemical applicator being devoid of substantial sharp edges of protrusions that may otherwise strike the pet or snag a collar of the pet as the pet brushes past the applicator. The front of the applicator includes a slit having a planar wick therethrough and therealong, the wick extending through the slit so as to define an interior portion for being soaked by a liquid chemical within the reservoir and an exterior chemical application portion. In use, as the pet brushes past the pet door and the chemical application portion rubs across the hide of the pet, applying the liquid chemical thereon.

Abstract: There is provided a powdered chemical applicator for a pet door, the applicator comprising: a substantially wedge shaped body defining a powdered chemical reservoir therebetween and wherein wedge shaped body presents a ramped transition between the surface of the pet door above the chemical applicator and the front of the chemical applicator being devoid of substantial sharp edges of protrusions that may otherwise strike the pet or snag a collar of the pet as the pet brushes past the applicator from the top to the bottom of the applicator in use; and the front comprises at least one vent such that, in use, as pet door is deflected by a pet, the powdered chemical is jostled within the powdered chemical reservoir such that at least a some thereof becomes airborne such and at least some of the airborne powdered chemical is ejected through the at least one vent onto the pet.