once izzy's hips were pre-limed i started her drag weighting. she started at about 7 months with empty 1 gallon jugs(2) with some rocks in them. this gets them use to the noise of something dragging behind them but there is no weight to it. she is 11 months now and does , about, 50lbs, maybe a half mile, 3 times a week. she has yet to see a cart (mostly cuz i like the grass in my yard) but we will start that soon. drag weight is great exercise, just make sure you don't go so far that you have to drag it back ! #-o