The present invention provides a bridle for an animal, such as a horse, wherein the bridle can be adjusted, and readjusted, simply, and without altering buckles, clasps, and/or fasteners. Such an adjustable bridle for mounting on the head of an animal includes a mouthpiece including an elongate bit having a first end and a second end, a first strap, a second strap and a pulley ring, wherein the first strap is shorter in length than the second strap, wherein the first strap has a first end and a second end, such that the first end of the first strap is attached to the first end of the bit, and the second end of the first strap is attached to the pulley ring. The second strap has a first end and a second end, corresponding to the first end and the second end of the bit, respectively, such that the first end of the second strap is attached to the first end of the bit along with said first end of the first strap, and the second end of the second strap is attached to the second end of the bit, such that the second strap passes through the pulley ring.
