Pronto Pup Company headquartered in Portland, Oregon, would ship the franchisees the proprietary flour mix, but the rest was up to the business owners. There was only one rule: Pronto Pups could only be served plain or with mustard, but no ketchup. However, this rule was relaxed several decades later. Following World War II, servicemen who had sampled and helped build the immense popularity of Pronto Pups while stationed throughout the Western states, realized the possibilities in Pronto Pup shops for their own post-war business. Franchises sprung up from coast to coast and Pronto Pups become a national sensation. Very few of these original Pronto Pup franchise restaurants exist today, but Pronto Pups can still be found at many carnivals and county fairs courtesy of franchise street vendors. Pronto Pup Franchises Those who wish to visit the “home of the corn dog” can visit the Original Pronto Pup location in Rockaway Beach, OR. Founded in 1941 and as one of the few brick-and-mortar Pronto Pup franchises, they celebrate their history by also being home to the World's Largest Corn Dog and the World's Only Mechanical Riding Corn Dog at The Original Pronto Pup location off Highway 101. One of the largest in the Mid-West is the franchised Pronto Pup booth at the annual Minnesota State Fair owned by the Karnis family. "Pronto Pups make up roughly 55% of hot dogs sold each year at the fair." References Brand name hot dogs Food and drink companies established in 1941 1941 establishments in Oregon Companies based in Portland, Oregon Food and drink companies established in 1962 Privately held companies based in Oregon 1962 establishments in Oregon