A leg spreading device for an animal in a milking stall includes a first and second elongated elements forming a first raised surface provided with a left side edge and a second raised surface provided with a right side edge. The elongated elements are oriented in a manner such that a transverse distance (w) between the left side edge of the first raised surface and the right side edge of the second raised surface increases continuously in a longitudinal direction of the elongated elements from a first transverse distance in the first longitudinal position to a second transverse distance in a second longitudinal position.