Adventure Plus for Dogs® offers immediate relief from fleas. It starts working through contact, killing fleas on dogs within 12 hours to prevent further infestations. Adventure Plus for Dogs provides Triple Flea Protection: Starts working through contact, the Insect growth regulator (IGR) kills flea eggs and prevent reinfestation, and kills larvae to break the flea life cycle. Adventure Plus for Dogs comes in a four-dose package. Each dose lasts for up to four weeks for a total of four months of continuous protection. Adventure Plus for Dogs is water-resistant and remains effective following a bath, swimming or after exposure to rain or sunlight.