Bravecto Chews For Extra Large Dogs 88-123lbs (40-56kg) - No Rx requiredBravecto 1400 mg For Extra Large Dogs 88 123lbs (40 56kg) Up to 12 week protection against fleas and ticks in an oral chew. The active substance of Bravecto, fluralaner, a new ectoparasiticide belonging to the isoxazoline group, is systemically active against fleas and ticks (black legged tick, American dog tick, and brown dog tick), delivering protection for up to 12 full weeks. It also kills lone star ticks for eight weeks. Presented in a highly