Mmmm that's iffy. Sorting and cutting are two different beasts. That's why you can't have a cutter and a sorter (that does well, anyway.) You're asking for two different things with the calf. You really need a few real cows for sorting. What horse would you use? If it was trained for sorting the mechanical cow would mess it up. If your horse is new to sorting, what you really need is to find a field with cattle, and have your horse track the cow. Follow behind the cow move for move. Where it turns you turn. Start off really slow, just walking easy, then increase speed as you progress. Your goal is to have your horse track a cow on its own, without your help. Once that happens, your horse has to learn to rate. That's putting the cow where you want it. Start off slow again, and work to push the cow to the right, then the left, then to that tree over there, then towards and away from cows. Then pick up speed. Get to the point that if someone lowers the tailgate of their truck you could put a calf in the back of it. ;) A mechanical cow can't really help you there.