The Purina Pet Food Brand is a well-known brand of pet food that has been around since the 1930s. The brand is owned by Nestle Purina PetCare and is known for its high-quality products. One of the most popular products from the Purina Pet Food Brand is ALPO, a four-letter word that stands for 'All Life Stages Performance Optimal.' ALPO is a complete and balanced diet for all life stages of dogs, providing them with the nutrition they need to stay healthy and active.