die, then hit "respawn"
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You will lose all the items in your inventory and your experience and respawn.
If you die in Minecraft and have not placed a bed, you will respawn at your original spawn point. Wherever that may be...
You can breed them just like any other animal in minecraft, but they will also just respawn if you wait long enough.
what you do is press escape or Esc on your keyboard that will make minecraft pause. Then go to options the change to difficulty to hard wait for night then wait for something to kill you. After you respawn change it back to easy or peaceful or what you were playing on.
You can't respawn the Ender Dragon in Minecraft without some kind of mod. Single Player Commands and the Essentials Bukkit server plugin can both be used to spawn mobs.Whatever you do, don't spawn it outside of the End, unless you don't mind your world being bombed.