Approximately 95% of fleas in a home are in immature stages, allowing them to remain dormant for a long time. That’s why Advantage II kills fleas at all life stages with a one-two punch: Imidacloprid attacks the nervous systems of existing fleas, killing 98-100% of them within two hours. Pyriproxyfen then prevents eggs from hatching, ending the flea lifecycle. Lasting a full month, this squeeze-on topical application actually kills fleas through contact, meaning they don’t have to bite your pet to ingest the treatment and die. Advantage II comes in three weight ranges for cats. Please come by our office or give us a call for further information.