There's been chocolate dogs around for generations. The way I see it, the term "fell" is a catch all that encompases the patt, the lakie etc. It's a general term and the others are more specific. My old Billy to me was a border/lakie, but to another bloke at a show might have called him a lakie, or a fell or even a red patt. Makes no difference....he was still a twat of a dog