BRAVECTO (fluralaner) Chews for dogs is the #1 longest-lasting chew* for powerful flea and tick protection. Easy and convenient to administer just one dose of vet-recommended and FDA-approved BRAVECTO starts killing fleas and ticks within hours prevents flea infestations kills ticks (black-legged tick American dog tick brown dog tick and Asian longhorned tick) for 12 weeks* and kills lone star ticks for 8 weeks.