Utility Mobs are disabled as mobs. They are sadly counted as hostiles and therefore town blocks them from being spawned. A few get through, but they usually despawn in a few minutes, therefore you can't make this in town. I was just on this snapshot trying to figure out what you do with mules. I figured out you have to have a horse on a leash first, and then attach the mule to it Then it took another several minutes for me to figure out you need fences to attach them to. Tomorrow i'm going to do something with the leashes and a bunch of mobs... I don't know what, i'm going to make it as I go along
Nice, but don't forget there is always the MC wiki to help you out. I've been hanging around with horses for a bit. They're quite unique. Some Jump higher than usual, some are faster, and some have a better health. So far I seen, the White horses do jump higher than usual I noticed. The maximum It can do is 3 and a 1/2 blocks. The black and white horses have a lightning speed! When I mean black and white, Its that pattern cows have, no spots or anything. And at the moment, I have not finished seeing which horse has the most health. But the wiki does says Health bugged because breeding 2 horses with golden apples/Or any food will lead you to get some baby horse with 35 hearts. Yet re-logging to the game, the baby horse lost its hearts to the same amount as its parents. Mules are simply another kind of look/use of a donkey, since they are breeded by a Donkey and a Horse. The Mule is born! With some physical looks of a brown horse, and physical looks of a donkey. The mule can also have a chest like the donkey.