They are structures of straps or strips of various materials (leather, fiber, plastic, fabric, canvas, etc. ) , which are adapted to the snout of an animal, to guide it and in some cases to prevent it from biting or to prevent it from eating. It is most commonly used in horses and dogs. In the case of horses it is also called bridle, halter or muserola. Also in some countries it is synonymous with mask, masks.