Bio Spot Active Care Flea & Tick Spot On Kills fleas, flea eggs, flea larvae, ticks, tick nymphs and tick larvae Kills and repels mosquitoes that may transmit heartworm The Smart Shield Applicator, specially designed to make applying flea and tick control easier Available in 1, 3 and 6 month applicator packs* (* is not available in refill packs) Fast-drying formula works with the biology of your dog by spreading through the oils of his skin