There is a set of dog shows in Murfreesboro this weekend here:
Tennessee Livestock Center
Middle Tn State Unv Arena
Animal Sheds Cattle Barn Hog Bldg
Murfreesboro, TN
and the following weekend in Memphis Oct 8 & 9 here:
Show Place Arena
105 South Germantown Pkwy
Go down and see if you can find someone to teach you to post them properly. Like Micdobe said, check the dane, dobe & boxer & minpin ring. Technically, you're not supposed to have an unentered dog on the showgrounds, but as long as you stay low key, chances are nobody will notice. Take your taping supplies and a crate if you have one.
Wait until after they are done showing their breed, though, and they'll be more likely to help you.
I have a couple friends that will be showing dobes at the Memphis shows. If you'll go, I'll tell them to look for you.