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Comfortis is an ideal flea and heartworm preventive oral treatment for dogs. The monthly chewable tablet treats and prevents fleas and controls flea infestation as well as flea allergy dermatitis. The oral tablet eliminates the possibility of heartworm disease by destroying the immature form of heartworms. Comfortis PLUS starts killing fleas in just 30 minutes. It protects dogs against heartworm infestation and removes other intestinal worms including hookworms, whipworms, and roundworms. The broad spectrum tablet covers wide range of parasites and protects dogs from harmful diseases.