When kitty meows for his chow, Nestl� Purina PetCare listens. The firm, a subsidiary of Swiss food giant Nestl� S.A., is the world's largest pet food producer. Its portfolio of some 30 brands includes Alpo, Beneful, Cat Chow, Dog Chow, Fancy Feast, Friskies, Mighty Dog, Pro Plan, and Purina ONE. It also makes cat and dog litter products under the Tidy Cats, Yesterday's News, and secondnature names. Purina products are sold internationally by mass merchandisers, supermarkets, pet supply stores, and online retailers, including Wal-Mart, Target, PetSmart, Hy-Vee, and Amazon.com. Besides pet supplies, the firm offers health insurance for dogs and cats through its PurinaCare Insurance Services subsidiary.