repairing things or enchanting also naming
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Use an anvil in creative mode.
Yes, with another bow or a wooden plank.
Listen I think I'm a little late but as we all know minecraft 1.4.5 released and just use the anvil the fixit!
You get a name tag, and rename it using the Anvil. When you rename it in the Anvil, you right click the name tag, on the Wolf, and it will name it the name you chose.
Use Iron Ingots on an Anvil in Minecrafft 1.4+. (It requires XP)