Product Description: Deflea Rtu Cat Shampoo 8 Oz. Attacks The Physical Structure Of The Flea Or Pest By Dissolving The Waxy Protective Coating.The Other Active Ingredient (Primarily A Laxative In Laymens Terms) Is Then Able To Penetrate The FApply Deflea Shampoo Onto Coat Of PetWork Shampoo Into Pets Coat Until A Lather FormsTreat The Entire Pet Including Hard To Reach Areas Such As Between PawsRinse Animal & Dry Thoroughly Ingredients: Undecylenic acid.