Most working dogs'll do the mileage fine. Kenny from a couple of pages back will do 20 milers with me and want to be out again 5 mins later. I'm glad I researched and discounted huskies early on (like beagles apparantly, very independant) The one that comes to mind instantly when thinking of running is greyhounds. Apparantly another bad idea. Although they run fast, it's only for short distances. The quote I remember is "If you get a greyhound, you lose your sofa"