
Can't help you on what lead. But yes, do get a different lead for walks to showing. A dog gets used to different leads. one means "work" and one means "walk" I had 3 leads for one of my girls, one was her show lead, one was her walking lead, another for her obedience. She knew what to do by the lead (once of course she had been trained!)
Edited to say: Pugs need a half check. see http://www.champdogsforum.co.uk/board/topic/61432.html :)