I am using the EntityInteract event to try and tell when a player right clicks entities, and it has worked on everything I've tested so far besides the end dragon. For some reason it's like it has no idea when I right click it.

 

This is what I'm using on the event.getTarget() to check if its something alive.

if(target instanceof EntityLivingBase&&!(target instanceof EntityPlayer))

 

And just in case the all the code for the event is in the spoiler below.

 

/**
 * I use this to scrape entities, with basic or advanced scraper.
 * Also at the bottom it is used to handle the wooly and milky genes
 */
@SubscribeEvent
public void rightClickEntity(EntityInteract event)
{
	EntityPlayer player = event.getEntityPlayer();
	Entity target = event.getTarget();
	World world = event.getWorld();
	if(event.getHand()==EnumHand.MAIN_HAND&&!world.isRemote&&player.getHeldItemMainhand()!=null)
	{
		if(target instanceof EntityLivingBase&&!(target instanceof EntityPlayer))
		{
			EntityLivingBase livingtarget = (EntityLivingBase)target;
			player.getHeldItemMainhand().damageItem(1, player);
			ItemStack organicmatter = new ItemStack(GRItems.OrganicMatter, 1);
			String name = livingtarget.getName();
			//Start special snowflakes.
			if(livingtarget instanceof EntitySkeleton)
			{
				EntitySkeleton skeleton = (EntitySkeleton)livingtarget;
				if(skeleton.func_189771_df()==SkeletonType.WITHER)
				{
					name = "Wither Skeleton";
				}
			}
			if(livingtarget instanceof EntityPigZombie)
			{
				name="Zombie Pigman";
			}
			//End special snowflakes.
			if(player.getHeldItemMainhand().getItem()==GRItems.MetalScraper)
			{
				livingtarget.attackEntityFrom(DamageSource.causePlayerDamage(player), 0.25F);
				ModUtils.getTagCompound(organicmatter).setString("entityName", name);
			}
			//Gives more info than other one for use in cloning, but makes items not stack.
			if(player.getHeldItemMainhand().getItem()==GRItems.AdvancedScraper)
			{
				livingtarget.attackEntityFrom(DamageSource.causePlayerDamage(player), 1.0F);

				NBTTagCompound entitytag = livingtarget.getEntityData();
				NBTTagCompound itemtag = ModUtils.getTagCompound(organicmatter);
				livingtarget.writeToNBT(entitytag);

				itemtag.setTag("mobTag", entitytag);
				itemtag.setString("type", livingtarget.getClass().getCanonicalName());
				itemtag.setString("entityName", name);
			}
			EntityItem entity = new EntityItem(event.getWorld(), livingtarget.getPosition().getX(), livingtarget.getPosition().getY(), livingtarget.getPosition().getZ(), organicmatter);
			event.getWorld().spawnEntityInWorld(entity);
		}

		//START WOOLY/MILK GENES
		if(target instanceof EntityPlayer)
		{
			EntityPlayer targetplayer = (EntityPlayer)target;
			if(ModUtils.getIGenes(targetplayer)!=null)
			{
				IGenes targetplayergenes = ModUtils.getIGenes(targetplayer);

				if(player.getHeldItemMainhand().getItem() instanceof ItemShears&&targetplayergenes.hasGene(EnumGenes.WOOLY))
				{
					ItemStack wool = new ItemStack(Blocks.WOOL, 1);
					EntityItem entitywool = new EntityItem(event.getWorld(), targetplayer.getPosition().getX(), targetplayer.getPosition().getY(), targetplayer.getPosition().getZ(), wool);
					world.spawnEntityInWorld(entitywool);
				}

				if(player.getHeldItemMainhand().getItem()==Items.BUCKET&&targetplayergenes.hasGene(EnumGenes.MILKY))
				{
					if((player.getHeldItemMainhand().stackSize-1)<=0) player.setHeldItem(EnumHand.MAIN_HAND, new ItemStack(Items.MILK_BUCKET));
					else if(!player.inventory.addItemStackToInventory(new ItemStack(Items.MILK_BUCKET))) player.dropItem(Items.MILK_BUCKET, 1);
				}
			}
		}
	}
}

 

The end dragon has sub-parts which I believe are an entirely different class.

Thanks, I have to treat it like a special snowflake but I was able to check for the ender dragon parts class whatever it's called, but it worked.