[1.7.10] Hiding Living Entities

I was wondering how to hide a mob from the player (client-side). I don't mean giving it an invisibility effect, but I mean preventing the player from rendering it in the first place.

I have some code below which is supposed to hide pigs when the player presses M, but doesn't do anything at all:

[spoiler=Hidden]Main Class:

package draconwolver.main;

import net.minecraft.client.settings.KeyBinding;

import org.lwjgl.input.Keyboard;

import cpw.mods.fml.client.registry.ClientRegistry;
import cpw.mods.fml.common.FMLCommonHandler;
import cpw.mods.fml.common.Mod;
import cpw.mods.fml.common.Mod.EventHandler;
import cpw.mods.fml.common.event.FMLPreInitializationEvent;

@Mod(modid = Mod.ID, name = Mod.NAME, version = Mod.VERSION)
public class Mod {
public static final String ID = "mod";
public static final String NAME = "Mod";
public static final String VERSION = "1.7.10-1.0";
public static KeyBinding key;

@EventHandler
public static void PreLoad(FMLPreInitializationEvent PreEvent) {
	key = new KeyBinding("Mod", Keyboard.KEY_M, "key.categories.misc");		
	ClientRegistry.registerKeyBinding(key);
	FMLCommonHandler.instance().bus().register(new KeyInputHandler());
}
}

Event Class:

package draconwolver.main;

import net.minecraft.client.Minecraft;
import net.minecraft.client.settings.KeyBinding;
import net.minecraftforge.client.event.RenderLivingEvent;
import cpw.mods.fml.common.eventhandler.SubscribeEvent;

public class KeyInputHandler {
private static KeyBinding key = Mod.key;
private static boolean bool = false;

        @SubscribeEvent
public void onKeyInput(InputEvent.KeyInputEvent event) {
	if(key.isPressed()) bool = !bool;
}

@SubscribeEvent
public void onRenderLiving(RenderLivingEvent.Pre event) {
	if(bool && event.entity instanceof EntityPig) {
		event.setCanceled(true);
		Minecraft.getMinecraft().thePlayer.sendChatMessage("It works!");
	}
}
}

All help is appreciated, thank you!