Minecraft – How to turn off animals in creative mode

The solution I can think of is using MCP, which allows you to change the source code of Minecraft (including changing the animals). But if you can't do that, try using these files.

If you have 7zip, open up your minecraft.jar and paste the files inside the zip inside jar. Then delete the META-INF folder inside.

If you have cheats enabled in the world then you can use the command /kill to respawn at the spawn point. You can use the command /gamerule keepInventory true to avoid losing items on death.