If you bought minecraft. If you don't know, they're called 'Skins'.
Go to their site and hit the 'Skins' tab then search for a look you like, click it and press 'Change skin'. This will redirect you to related site and will ask you if you would like to change your skin to the one specified. This might take you to the Minecraft.net homepage first, so you may need to try again. Click 'Change' to change your skin.
Just so you know, you must be online in Minecraft for your skin to appear. If you are playing in Offline Mode, you will be set with the default steve skin.
So yes, you CAN change costumes in Minecraft.
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Unfortunately, you can not change your name on Minecraft!
You can change your minecraft clothes if you change your skin or download a mod.
Look up the default controls on the minecraft wiki page, go to the control settings in minecraft, and change them.
No you cannot change your minecraft email account, but it is possible to change your screen name by loging in to minecraft.net with a different computer...
For starters these minecraft dogs you are referring to are wolves and no they won't ignore you if you change your skin