A Muzzle is a device fitted over the mouth, drawn from real-world animal use and adapted for Petplay and related traditions. Muzzles range from soft signalling gear to more restrictive designs and are used for aesthetic, ceremonial and scene-specific reasons.

Muzzles have appeared in Petplay throughout its modern development, borrowed from companion-animal practice.

Muzzle use raises safety questions including breathing, hydration and communication. Communities generally treat muzzling as a matter for negotiation and careful monitoring.