There are many types of flea preventions out there, including collars, powders, sprays, topicals, dips and the list goes on! But what type should you use and when to start it will vary. It is very important to read the label on the type of prevention you purchase. We recommend to use Frontline topical or Advantage topical for puppies and kittens. These products are safe to use as early as 8 weeks of age in most cases. You want to continue to re-apply these topical preventions once monthly and continue year round.