The term 'Big Name in Pet Foods' refers to two well-known brands: Ralston (7 letters) and Iams (4 letters). Ralston is a pet food brand that has been around since the late 1800s, and is known for its high-quality ingredients and commitment to animal nutrition. Iams is a more recent brand, founded in 1946, and is known for its wide range of products and its focus on providing complete and balanced nutrition for pets. Both brands are popular choices for pet owners looking for quality pet food.