Lead

Leads, also known as leashes, are items used to leash and lead mobs.

Usage and behavior
Right-clicking on a mob while holding a lead will tie it to the mob, allowing it to be moved by the player. Right-clicking on the mob again will release it. Other inventory spaces can be selected while holding the lead, multiple mobs can be attached to a lead at once.

With a mob on a lead, right-clicking onto a fence will attach any leads you are holding to the fence with a visible knot (requires a second lead). Attacking the knot or removing the fence post removes the lead(s). Also if an arrow (Shot by any source [Including Skeletons]) hits the knot, then the knot will break and drop as an item (Including Creative Mode)

A lead will stretch a maximum of ten meters before breaking. Whenever a lead is removed or broken it will drop as an item at the location of the mob.

Most passive mobs can be "leashed". These include: horses, wolves, cats, sheep, pigs, cows, mooshrooms, chickens, and squid. The same can be done to Iron Golems and Snow Golems. Bats and Villagers are the only passive mobs which cannot be attached to a lead, and any mobs which naturally despawn (such as the squid) will still despawn if they are attached, unless the mob was named with a Name Tag.

It is not possible to attach hostile mobs by traditional methods, but can be done by modifying the region save files. Certain mobs (e.g. bats) however, as well as players, cannot be attached even with this method.

Trivia

 * The lead can extend out to 5 blocks when tied between a fence post and a mob.
 * The lead is named as 'leash' in the texture file.
 * Untamed ocelots can be captured and tied up using a lead.
 * In Creative mode, players can leash mobs, pull the mob into the air and tie it to a fence post up high. However, the lead tends to break if the player moves upward too quickly.
 * Despite that the lead is made of string, it has the appearance of rope.

Gallery
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