Rin Tin Tin? Nope, sorry. The original was WWI. I do remember Rinny from "The Adventures of Rin Tin Tin" 1950s TV show in which the setting was Fort Apache in the Old West. Nope, this dog is instead a mascot for the modern era GI's and was included in a large boxed set that we'll be covering later, and in that set he's labeled as 'K9'. I'm not at all sure if he showed up in header bag sets.
Ed