yes you are allowed to mod mine craft you cane have hero brine mod or any other
mod
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Horses can only be found in Minecraft through a mod(Mo' creatures), so you can edit the mod's settings to adjust the horse limit.
a mod where you can fly a plane on minecraft so get it
Mo Creatures is a modification (mod) for Minecraft. You can get this mod by downloading it from The Minecraft Forums.
The Ender Dragon is a part of Minecraft, not a mod. You probably need to update Minecraft.
SDK Planes Mod, I guess you could find it on Minecraft Forums