Advantage II for dogs.Medium (11 to 20-lbs, Teal Color Code)Once-A-Month Topical Treatment for Fleas and LiceFleas can make your dog miserable, which is why killing fleas with monthly treatment is so important for your dog all year round. Here are the benefits you can expect from Advantage II for dogs:- Kills through contact so fleas don't have to bite to die- Kills all flea life stages- Topical application- Kills reinfesting fleas within 2 hours- Prevents fleas on a treated dog from infesting your home- Kills lice on dogs- Waterproof- Lasts for one month- For use on dogs and puppies 7 weeks of age and older