Anyone can raise up dogs like this EWO, and I have seriously considered doing exactly that in the past but never did. It is a two part process. Step one, taking the time to actually get pups out on the trail and find the ones with the best endurance. Step two, establishing this kind of work ethic and tolerance as a baseline selection criteria. Would you eliminate some potentially good dogs along the way if let's say you culled the bottom half of a litter by 12 weeks using stamina as a selection tool? Sure, but the ones you keep that made the grade would be heads and shoulders above average physically at maturity. Coupled with gameness and some ability, dogs that had that kind of stamina would be very tough to beat indeed!