Wrong, the only terrier purposely bred as an all rounder was the plummer,look at the breeds in its make up, as for your retrieving question well all dogs can be taught to retrieve, starts with any soft toy in the garden as a pup and developed from there, I bought a good friend of mine a patterdale off a hard well known digging dog in Liverpool, my mate used to be the secretary of a working gun dog club and although a bit hard mouthed loved a day shooting/retrieving, a bit of brain and patience on both sides will do it, a good Plummer works anything you care to teach it,very intelligent and thr