MorphMinus Beta addon for Minecraft PE will give you an opportunity to transform in any mobs which you will want. You can be a pig, wolf, zombie or another entity. I think it you will have a lot of fun with this mod.
How to use this addon?
You need to type the commend, which you will see below. For example you want to be a sheep, so you need type in chat: -/function morph-to/sheepTo transform back to your original Steve skin you need to type the next commend:
You may also type HELP command:
/function mm/help i
Download addon for Minecraft PE 1.12 +