Hi Joe,
I've double-checked Dominic's Song Book "Ireland Sings" and his follow-up songbook "The Singing Irish" and he has not published this song in either collection. It is interesting, or maybe not, that the song gets a mention as one of his big songs in Wikipedia and some other web pages on Dominic. It is not surprising to see Frank Harte had this song as himself and Dominic would have shared and swopped songs songs in the good old days. However, where it came from is still unresolved.