Frontline Plus kills the fleas within 12 - 24 hours
after contact with the active ingredients. It is possible you will see fleas on
your dog because the flea’s life cycle is between a few weeks and a few months.
It can also take a few months to have good protection against fleas. If you
apply the product every month in a 2 or 3 month period, you should have good
protection. When you stop applying the protection and start again in a couple
of month’s time it can take another 2 or 3 months to be protected again. If the
level of the flea infestation is high you can administer Capstar but not more
than one treatment per day.