It’s a tongue-in-cheek quip (but not entirely tongue-in-cheek) that the only thing three dog people can agree upon is that two of them are getting it wrong. Consider this report by Lawrence Tipson:

“Probably no other subject in relation to doggy affairs has been more written about or has given rise to more controversies, all more or less rancorous,  the past twenty years, than the origin and true type of the Skye Terrier. At the same time, these controversies have left the subject in dispute pretty much as they found it, and although more or less light has been thrown on the different points at issue, no conclusion has ever yet been reached that was satisfactory to all fanciers of this breed; the disputants, after airing their theories and attacking their neighbors’, ending as they began, each with his own opinion unaltered.” 

Would it surprise you to learn that this was written in 1891?  Historians and fanciers still like to quibble over the origins of “the heavenly breed,” but all can agree that the dog described by Johannes Caius in 1570 could only be the Skye Terrier, and that it’s the only terrier distinctively belonging to the northwestern islands that’s not common to the whole of Scotland.

Pencil and charcoal drawing of Skye Terrier dogs by Morgan Dennis (American, 1892-1960)