With 100% natural active ingredients, ALZOO shampoo is proven to effectively repel fleas, ticks, and mosquitoes. Protection begins from first application. Recommended to apply once every two weeks and no more than once a week. Do not use on puppies under 4 months. ALZOO products do not contain chemical pesticides, which can be dangerous to apply and harmful if over-used. ALZOO products are designed to be used together to establish an optimum, natural “zone” of repellent protection to protect your pets without chemicals. USE ALZOO PRODUCTS AS A SYSTEM. THE KEY TO PREVENTION AND FOR MAXIMUM EFFECT IS TO BEGIN USING ALZOO EARLY, EVEN BEFORE THE SEASON STARTS. Establish a zone early, ideally 30 days before the season. Create a repellent environment around the home and on pet before pests typically begin to bite.