Merial keeps animals merry. The company makes a variety of drugs and vaccines that treat and prevent disease in pets, livestock, and wildlife. Used by veterinarians, farmers, and pet owners in some 150 countries, the company's products include Ivomec, an anti-parasitic for livestock; Frontline flea and tick treatments for cats and dogs; heartworm prevention drug Heartgard; and rabies vaccine Raboral. Merial focuses its R&D on combating parasites, viral and bacterial invaders, and pain, as well as treating chronic conditions of household pets. The company is owned by Sanofi-Aventis.