what you should do if you find a fairy dog

thanks british library flickr

Hafod y Gareg's wife is on her way home from church when she comes across a tiny, exhausted dog.  This is the opening to a Welsh folktale that manages to dovetail a test of character and a trick question in a very short time.  Where did the dog come from?  Or...whom? Does she pass on all counts?  Aren't you curious?