company, Ralston Purina also made some other pet-related products, such as Tidy Cats brand and Yesterday's News cat litter, which is made from recycled newspaper, purchased from Edward Lowe Industries in 1990. Also, Purina has honoured several Canadian animals every year since 1968 in their Animal Hall of Fame. The latest inductees included a police service dog which "rushed and subdued an armed robber". Acquisitions and diversifications In 1974, Ralston Purina purchased and further developed the Keystone Resort in Colorado. "Checkerboard Flats" for kids and beginners at Keystone still bears their logo. In 1993, Ralston Purina also bought Breckenridge ski area for an undisclosed amount, from Victoria U.S.A. Inc, a Japanese sporting goods retailer. However, both ski resorts were sold in 1997 to Vail Resorts for $331 million. In 1977, Ralston Purina acquired Missouri Arena Corporation and the St. Louis Blues National Hockey League franchise. During the company's ownership of the team, they changed the name of the St. Louis Arena to the Checkerdome, reflecting the Ralston Purina logo. The franchise was sold to Harry Ornest on July 27, 1983. Ralston Purina purchased the Eveready Battery Company in 1986, owner of the Eveready and Energizer brands. The company was spun off in 2000. Ralston Purina purchased Continental Baking Company, makers of Wonder bread and Hostess cakes, from ITT in 1984. Ralston spun off Continental Baking Company, subsequently bought by Irving, Texas–based Interstate Brands Corporation (IBC). Ralston Purina opened test market pizza stores called Checkerboard Pizza in 1986. The format was similar to Domino's and Little Caesars. They opened the stores in markets such as Moorhead, Minnesota, to test how the Midwestern market would accept the concept. They did well, but Ralston Purina decided not to enter the pizza franchise business and closed all pilots by late 1987. Ralston Purina also owned Jack in the Box fast food restaurants from 1968 to 1985, along with several high-end restaurants. Ralston Purina owned Van Camp Sea Food Company from 1963 to 1988, a tuna cannery with Chicken of the Sea as its main product. Ralston Purina owned an animal pharmaceutical company in the 1970s and 1980s. Logo Ralston Purina's "checkerboard" trademark was introduced in 1902. It was inspired by William Danforth's childhood memory of a family dressed in clothing made from the same bolt of checkerboard cloth. The company's headquarters was called Checkerboard Square. Danforth used the design as the visualization of a