We highly recommend Vectra for flea control and Vectra 3D for both fleas and ticks. This is a once monthly dose that is applied from the shoulder blades to the rump. It kills adult fleas on your pet within 6 hours of coming in contact with the product. Fleas and ticks don't have to bite your pet to get the product. This is crucial to stop the transmission of tick-borne diseases to your dog. This product also has a second ingredient that prevents over 90% of the immature stages from becoming an adult flea. Please refer to the chart below for more information about the flea life cycle. The 3rd ingredient in Vectra 3D is for tick control. Please contact us for additional information and available rebates. Vectra 3D is not approved for use in cats.