You can't, you have to buy the full version to do that.
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You can change your minecraft clothes if you change your skin or download a mod.
It is currently impossible to change your skin in Minecraft Pocket Edition unless if you Jailbreak your device.
No
You change your skin. go to planetminecraft.com to change your skin. For the record, minecraft characters are asexual and therefore have no gender.
For starters these minecraft dogs you are referring to are wolves and no they won't ignore you if you change your skin