Abstract: An anti-barking and anti-biting muzzle for dogs includes a muzzle portion formed from a pair of generally trapezoidal flaps of elastic material sewn together along the converging edges thereof, with the flaps being further divided by a seam along the longitudinal centerline thereof to create four panel members of the elastic material. An elongated strap is connected at its ends to opposed seams of the muzzle portion. The muzzle can be slid onto the snout of a dog and the strap fitted over the dog's head behind its ears. The muzzle portion has a snug fit on the snout but the elasticity of the material allows the dog to open its jaws slightly for panting. If the dog tries to open its jaws wider to bark or bite the four elastic panel members apply a force to the jaws to prevent them from opening wide. The muzzle is not uncomfortable and it acts as a training aid since the animal associates the wearing of the muzzle as a form of punishment for barking or biting.