Novartis Program Once-a-Month Flea Prevention Flavor Tabs for Dogs 0-10 Pounds, 6 Tablets Program flavor tabs are labeled for use in dogs and puppies six weeks of age and older for the prevention and control of flea populations. Program works by sterilizing the female flea When Fleas lays eggs they will not hatch breaking the cycle of fleas You must treat all of the dogs and cats in the house with Program in order for this treatment to be effective Each pack contains 6 doses a six month supply