Frontline Plus for Dogs Flea & Tick Medium Breed Dog Spot Treatment, 23 - 44 lbs, 6 Count, Size: 6 Treatments provides six months of continuous protection against fleas, flea eggs, larvae, chewing lice, and ticks that transmit Lyme disease. This fast-acting, topical formula is specifically designed for medium dogs weighing between 23 and 44 lbs and is safe for puppies aged 8 weeks or older