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Bayer Advantage II topical flea prevention and treatment for extra large dogs weighing over 55 pounds is a vet-recommended monthly application that kills fleas through contact so they dont have to bite your dog to die. The protection of Advantage II kills fleas in multiple life stages including eggs larvae and adults effectively breaking the flea life cycle to prevent flea infestation on your dog. This dog flea treatment comes in a convenient topical liquid thats easy to apply fragrance-free and waterproof after 24 hours. A single application of Advantage II flea treatment for dogs starts working in 12 hours and keeps killing fleas for 30 days. Even indoor dogs need flea protection because humans and other pets can bring fleas into your home. Advantage II flea control for dogs is available in packs of one four or six monthly applications for dogs of all sizes. Bayer Advantage II is also available in a formula for cats. Fight the misery of biting fleas with the help of Advantage II flea treatment and protection for dogs from Bayer.