The Nova Scotia Duck Tolling Retriever: This Little Retriever Makes a Big Impression. The Nova Scotia Duck Tolling Retriever (NSDTR), a vivacious purebred, is often called Toller for short. Though, it goes by many names such as Little River Duck Dog, Little Red Duck Dog, Novie, Scotty, Tolling Retriever, Duck Toller, and Yarmouth Toller.