Applying a leash to a club creates an aklys.

A magic leash, which gives your pets enough speed to always stay by your side so that can move at your regular rate across a floor without constantly getting ahead of it and having to stop to wait for it.

Artifact leash that always makes the pet it’s attached to slightly faster than the player so that it won’t lag behind.

When blind and holding a leash with a pet on it, you can see the pet.

If the player drops a leash that’s in use or gets teleported away or dies, etc, the pet starts dragging the leash visibly on the map like a player drags an iron chain.

Rope golems sometimes drop leashes, bullwhips, or grappling hooks upon death.

When you have a slower pet leashed, slow down _ travel by resting whenever you would move far enough from the pet to pull on the leash.

Leashes show on the map so you can tell where a leashed invisible pet is.

You can leash peaceful and hostile monsters, but peacefuls will turn hostile, and they will attempt to get the leash off.

If a leashed pet falls down a trapdoor, the player may be able to pull it back out, depending on Strength and the weight of the pet.

Add a dogcatcher, who will come and impound your pet if it misbehaves (stealing from shops, killing Minetown citizens) and you don’t get it leashed before a certain amount of time has passed.