The crossword solution for the term 'POPULAR PET FOOD BRAND' is ALPO, a four-letter word. ALPO is a brand of pet food that has been around since 1936 and is owned by Nestle Purina PetCare. It is one of the most popular brands of pet food in the United States and is known for its high-quality ingredients. ALPO offers a variety of wet and dry food options for cats and dogs, as well as treats and supplements.