I’ve asked the same question myself.. A chili dog is a chili dog.. Here’s Wikipedias definition: (for what it’s worth): http://en.wikipedia.org/wiki/Michigan_hot_dog
Only thing that comes to mind is that it’s a regional name for a chili dog (similar to Coneys here in Michigan).. ??
Another website that may be of some interest: http://www.pressrepublican.com/apps/pbcs.dll/article?AID=/20051231/TODO/605100390/-1/TODO06