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CrossBlock II is a topical flea treatment for dogs that kills adult fleas as well as their eggs and larvae. It contains imidacloprid and pyriproxyfen, and start killing fleas within 2 hours and continues to work for 1 full month of protection. CrossBlock also prevents re-infestation of fleas by breaking the life cycle and preventing fleas from reproducing. Waterproof formula with easy open, individual dose applicators. For dogs and puppies 7 weeks of age or older weighing at least 3 lbs. Available in 3 month supply for dogs 3-10 lbs, 11-20 lbs, 21-55 lbs, & Over 55 lbs.
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