Thanks to a link trail that started at Retrieverman, I encountered the dogs known as "gollies."
Since our Shelby is (we were told) a collie-Lab cross, I suppose that makes her a "lollie." Her actual antecedents and, for that matter, her age, are a mystery to us. Much about Shelby is a mystery.
Actually, she is a Ninja Collie, bred for Stealth, Escape, and Deception.