How do you make a leash for a dog/tamed wolf on minecraft pe?

1. Turn off Peaceful difficulty.
2. Gather several bones by killing skeletons or opening chests.
3. Find a wild wolf. Wolves can be found in forest and taiga biomes, usually near spruce trees. They are not hostile unless you hit them.
In Creative mode, you can spawn a wolf anywhere.
4. Equip the bones. When you hold a bone, wolves will usually move toward you. Be very careful not to click on the wolf, or all surrounding wolves may attack you.
5. Press the tame button until the wolf is tamed. A Tame button will appear. Press this button, and you'll use up a bone and have a chance to tame the wolf. Ashes floating above the wolf means the attempt was unsuccessful. Hearts and a collar means that you've tamed the wolf. This will often take 3–6 tries. It can take more if you're unlucky.
Be very careful to click the Tame button and not the wolf. It's easy to click the wolf accidentally and turn it hostile.