When Advantage is applied to the back of the neck on cats and between the shoulder blades on dogs, this topical solution spreads naturally on the skin surface at the hair follicle level. Advantage flea control treatment continues to kill flees and their larvae even after a shampooing, swimming, rain or exposure to sunlight. Under normal conditions, one Advantage treatment will provide at least one month flea control on dogs and up to one month control on cats. In the event the pet swims more than once weekly, re-treatment may be necessary. The pet may be treated as often as once weekly!<%=str_Content%>