Kick fleas, ticks and chewing lice to the curb with PetArmor Plus Flea & Tick Spot Treatment for Dogs! PetArmor Plus is a waterproof, long-lasting formula that works to kill adult fleas and ticks plus stop the flea cycle dead in its tracks. Each dose offers up to one month of continuous coverage for most dogs ages 12 weeks and older. The fast-acting topical formula starts working within 24–48 hours. When it comes to flea and tick control, protect your pooch with confidence using PetArmor Plus! Ideal for dogs weighing 23–44 pounds.