Alpo, Purina, and Iams are all big names in the pet food industry. ALPO is a brand of dog food owned by Nestle Purina Petcare, which was founded in 1936. Purina is a brand of pet food owned by Nestle Purina Petcare, which was established in 1894. Iams is a brand of pet food owned by Mars, Incorporated, which was founded in 1946. All three brands offer a wide variety of pet food products for cats and dogs.