PET FOOD BRAND is a term that refers to the various brands of pet food available on the market. ALPO, IAMS, and PURINA are three of the most popular pet food brands. ALPO is a brand of dog food that has been around since 1936 and is known for its high-quality ingredients. IAMS is a brand of pet food that is made with natural ingredients and is designed to meet the nutritional needs of cats and dogs. PURINA is a brand of pet food that is made with premium ingredients and is designed to provide complete and balanced nutrition for pets.