A gag that works in a similar way as an over-the-mouth gag, only that they are usually made of leather, is fastened around the head with buckles and straps and cover the lower part of the face. It is so called because it resembles a muzzle used on animals, with a flexible pad which straps over the mouth, and sometimes also around the cheeks and chin.
Muzzle gags have a strong psychological effect on some people, because of the association of being restrained in a way generally associated with animals.
Restricting movement of the jaw and covering the cheeks can both increase the efficiency of a gag. It is difficult to draw the line between a muzzle gag and a head harness with an attached gag.
Muzzle gags are probably one of the oldest gags and illustrations showing muzzle-like gag devices such as scold’s bridles have been observed from early colonial times.
A muzzle gag may also have an attached posture collar and may also be fitted with an integrated pecker gag.