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. There is also provided a liquid chemical applicator for a pet door wherein the front comprises a slit having a planar wick therethrough and therealong, the 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, wherein, in use, as the pet brushes past the pet door the chemical application portion rubs across the hide of the pet applying the liquid chemical thereon. There is also provided a chemical applicator strip.La présente invention concerne un applicateur de produit chimique en poudre pour chatière, ledit applicateur comprenant : un corps sensiblement cunéiforme délimitant un réservoir de produit chimique en poudre en son sein et ledit corps cunéiforme présentant une transition inclinée entre la surface de la chatière au-dessus de lapplicateur de produits chimiques et lavant de lapplicateur de produits chimiques qui est dépourvu de bords de saillies sensiblement pointus qui peuvent sinon toucher lanimal de compagnie ou accrocher un collier de lanimal de compagnie, lorsque lanimal de c
