I don't want anyone to think, that Minis are just 'pets' who might be able to pull a cart. We have halter classes, classes for gelding/stallions/mares. We have colour classes. Many performance hunter classes (jumping). We also have obastacle trail classes. In driving, we have country pleasure, roadster and race classes. Even chariot racing, which is incredibly exciting and fast. Almost all of the above of course, in amateur, youth and adult classes. Dedicated Mini owners, often work long hours in training their horses, just like those with full size horses. They are also often sent to professional trainers, just like full size horses. Nothing much different about them really, except that none except very small children, can ride them.
Although a very few are, Great Danes and St. Bernards, are not normally put to the cart.
Sorry, I guess I should of rephrased myself. I think of them as "pets", I have never really been around Mini's much at all. I do have a couple of friend who own them and use them for like I said, to pull a cart/wagon and their kid did 4H with it. They were the only mini's that I have ever been around that were not ornery little cusses. When I was a teenager, a neighbor had two and that was the first horse that ever actually kicked me, but he was an ornery spoiled little brat two who they treated more like a dog then a horse. They would let him come into the house at times. I do find them cute, but have never really researched what all you can do with them. When it gets to the point that I can no longer care for or ride full size horses, I would probably research owning a Mini because I don't think I can ever be without some sort of equine again.
When we got our first Great dane, we taught her to pull a wagon for my 1 year old son. She loved and it would beg to for us to put her harness on.
I may have to research to see if there are any mini farms near me that I can visit and check the little guys out.