This tune comes from the Missouri Valley Region. I’ve heard it played many times by Dwight Lamb and Cyril Stinnett. It has a unique rhythmic feel, atypical of hoe-downs and reels, and may well have come from a Danish polka, as the area is home to descendants of Danish Immigrants from the late 19th Century. Of course, there’s no objective evidence for this — just one of my musical hunches.
This isn’t a particularly notey tune, but does have a little “up-the-neck” bit on the second part. Don’t let it deter you. Get the transcription here: http://www.charliewalden.com/Dots.htm.