former American manufacturer of cereals, packaged foods, pet food, and livestock feed. A merger with Nestlé (Nestlé SA) in December 2001 created Nestlé Purina PetCare Company.

The company—initially called the Robinson-Danforth Commission Company—was founded in St. Louis, Missouri, in 1894 by William H. Danforth, George Robinson, and William Andrews. In 1898 Danforth, the president of the company, launched a cracked-wheat cereal that became known as Ralston Whole Wheat Cereal (after a well-known health promoter of the 1890s, Albert Wester Edgerly, known as “Dr. Ralston”). A savvy promoter, Danforth renamed the company Ralston Purina and introduced the red-and-white checkerboard logo in 1902. After Danforth heard World War I soldiers referring to their meals as “chow,” Ralston's animal feeds became “animal chow.” In 1921 Danforth revolutionized the feed business with the introduction of pelletized animal feeds. Consumer sales grew through new cereals such as Wheat Chex (launched 1937) and Rice Chex (introduced 1950). Ralston Purina began selling in overseas markets in 1957, acquired Eveready Battery in 1986 (spun off in 2000), and moved out of the agricultural feed business in the 1990s. General Mills (General Mills, Inc.) acquired Ralston's breakfast cereal business in 1997.