I have a retired Greyhound and it would be amazing to say the least if I could get him to even STAND for longer than a few minutes, much less run on a treadmill! This dog is horizontal roughly 23 hours a day and asleep for maybe 20 of those hours! When they retire they truly retire! They don't need another job! Believe me, they deserve to enjoy the rest of their life on a couch. Plus, he would have to be able to see out the window because he is the neighborhood snoop - Mrs. Cravits! But I know he'd help if he could. He's my doggie love.