I hunt with Setters but have a special place in my heart for a Scot's Terrier, so I would take the little mugs in the cab with me on a hunt occasionally to have someone to keep me company on the long drives to a hunting spot. The problems were that they would light out after the Setters and having short legs were soon winded and I would often have to carry them back to the truck. Then because of their short stature they were shorter then the surrounding grass and could disappear in to the thinnest of cover. I spent a good deal of time hunting for dogs that were with in a 100 ft of the truck.
My Terriers were great for laughs and companionship but definitely not hunters.