3-dose Sergeant's Pronyl Otc Flea Tick for Dogs 23-44 Lbs Over 8 Weeks Dog Size: 23-44 lbs Dog Age: Over 8 weeks Supply: 3 Month/Dose treatment that provides your dog with rapid protection against adult pests- Kills fleas ticks and chewing lice. Protects your dog and your family against the diseases fleas and ticks spread, including lyme disease. For use on dogs and puppies 8 weeks of age or older.