Orlan's lead everything mod

Orlan's lead everything mod lets players attach vanilla leads to any entity — including modded mobs and custom creatures — while preserving Minecraft’s normal leash mechanics.

Leads are visible, behave like vanilla (can be tied, broken, or dropped), and work in singleplayer and on servers without requiring clients to install the mod.

Install on the server (or include in singleplayer), then right-click an entity with a lead to tether it as you would in vanilla Minecraft. Compatible with Fabric 1.21.1.