You don't craft collars for anything. You're probably thinking how wolves have them. People tame them by right clicking them with bones. Then they automatically get a collar.
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You can't make a collar. When you get a wolf, they automatically get a red collar. You don't need to make a collar.
No.
To change the color of a wolf's collar, right click on the collar with a dye in your hand.
It is called Minecraft because the primary things you do in Minecraft is, well, mine and craft.
No, but you can dye it's collar