Lead

Leashes are used to hitch animals to fence posts or nether brick fence posts, and also to lead them around.

Usage
Right-clicking with a leash in your hand will tie it on the animal that you are facing.

Most passive mobs can be "leashed". This includes pigs, chickens, cows, horses, sheep,squids, Iron Golems, Snow Golems and wolves. Bats and villagers are passive mobs which cannot be leashed. Note that leashed mobs that naturally despawn (like squids) still despawn. If leashed animals are ten or more blocks away from the player leashing them, the leash will "snap" and turn into the item.

Gallery
Leine 拴绳