PRONYL OTC 23-44 LBS by Pronyl OTC Dog Size: 23-44 lbs Dog Age: Over 8 weeks Supply: 3 Month/Dose reatment 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.