Pet Armor Plus Dog Flea and Tick 3-Month Supply Waterproof Topical Treatment is a three pre-measured topical treatments formulated for dogs 5 to 132 Pounds (See Size Options for appropriate sizing). Engineered to provide robust protection, it starts killing fleas and ticks within 24-48 hours and prevents flea eggs from maturing for 4 weeks. With this waterproof solution applied between the shoulders, even giant breeds get full-body coverage against parasites, ensuring they stay comfortable and itch-free. Available in Multiple Size or Options