Never been around terriers of any kind, till Devin talked me into a cross of his Jagd,Airdale. Been pretty happy with it thus far, but it is still a baby. This little dog is nuts, but he will go a 20 mile day will me beside a horse, fight cattle, and make it back to the rig everytime day after day.As for curs getting wore out gathering a "few 1000 acre pastures", cut them back on there feed, and use them more often.I know for a fact that I use mine daylight to dark, and never had them were out.Maybe the pitbull that Tony breeds into them takes out some of the dogs wind. Not being a dick, just saying that bred right a cur will wear out a horse, and 12 to 15 miles a day is common for us. not four times a year, I'm talking about 45 days in a row.I trade out horses but use the same dogs day after day, if a dog gets hurt, they get a break, I take a diff one,to fill the spot.Fed right, and shaped up, most dogs can keep up with horses on the gather.Just my thoughts.