The most common type of round horseshoe is the straight bar shoe. The straight bar shoe is a commonly used tool for treating various types of hoof disorders and injuries. Quarter cracks and white line disease are just two of the conditions that this horseshoe can help repair by holding the hoof together as it heals. Unlike a regular horseshoe, a straight bar shoe has an extra bar attached to the back of the shoe in a way that it forms a complete circle. This gives the horse more support on the back of the heel and leg. In addition, it helps to relieve pressure from the foot and to prevent future problems.