Advantage® II for Dogs is a vet-recommended monthly topical flea prevention and treatment for dogs that kills fleas through contact, so they don’t have to bite your dog to die. Advantage® II also kills flea larvae, flea eggs and chewing lice, effectively breaking the flea life cycle to prevent flea infestation on your dog. A single application of Advantage II flea treatment for dogs starts working in 12 hours and keeps killing fleas for 30 days.