Well Dave Rainwater from California, who I think plays lead fiddle for the Black Irish Band, did win the Galax fiddle contest in the early 90s, so his fiddling competence is not in question. That does not vouch for his historical accuracy. You might check the band's cds to see if there is any reference to the tune you heard.
Granny does your Dog Bite is still a popular fiddle tune in these parts. Only words I know are:
Granny does [or will] your dog bite? - No, child, no.
Daddy cut his biter off a long time ago!