This is a point in space where, for the purpose of various calculations, the entire mass of the body is concentrated. A standing horse's centre of gravity is in the median plane at the height of the point of the buttock approximately at the level of the 11th/12th thoracic vertebrae (just in front of the intersection of the lines joining the diagonaly opposite fore and hind hooves). When the horse is moving, the centre of gravity depends on the bodys positiôn and the distribution of mass with in it.