Elanco Animal Health announced the U.S. FDA has approved Credelio Quattro, becoming the broadest approved canine oral parasiticide with its protection against six types of parasites-fleas, ticks, heartworms, and the three risky intestinal parasites-roundworms, hookwormsii and tapeworms. Credelio Quattro is a single, monthly chewable tablet for dogs eight weeks of age or older.