The Dilly Dog — a dill pickle filled with an Angus beef hot dog, fried like a corndog and served on a stick — is selling at a rate of more than 800 for every Rangers game. (Courtesy Delaware North Sportservice)

Casey Rapp knew he had a concession-stand hit even before the Texas Rangers opened the Major League Baseball season, when the team’s new Dilly Dog started popping up in posts on Twitter and Facebook.

But when Rapp, general manager of Delaware North Sportservic...

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