firstly you need to tame your horse, there are many tutorials for this, next you have to obtain a name tag from a dungeon test. these are not to rare in the new update. then you go over to your horse right click it with the name tag and you should be prompted to put a name in a box and then when you come out of the menu you will be able to see the horses name if you're a few blocks away from him and looking directly at him.
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The Horse Update
Right-click it.
how do you tame a horse in minecraft 1.7.4?
Minecraft is supposed to be genderless. A horse can be either a boy or a girl if you want it to.
there are no horses