Protect your furry friend from fleas and ticks with Frontline Shield Spot-On Treatment. Specifically designed for adult dogs weighing 21 to 40 pounds, this extra strength protection comes in a pack of 6 doses to keep your pet safe for months to come. The Shield model ensures maximum coverage and effectiveness against pesky parasites, while also being easy to apply. Trust in the Frontline brand to provide your dog with the best defense against fleas and ticks.