Hartz UltraGuard Pro Flea & Tick Treatment for Dogs an Puppies over 15 lbs is a monthly topical treatment that kills fleas, deer ticks and mosquitoes plus kills flea eggs and larvae to prevent future infestations for up to 30 days, stopping the flea life cycle. It features the proprietary Pro-cision Flo applicator that easily penetrates fur for improved application, directly onto your cat’s skin. Use only on dogs and puppies between 15-30lbs. Package contains three applications—a three-month supply.