Abstract: A cattle alley includes a forward and rearward generally inverted U-shaped frame connected by an elongated bar between the base portion of each U-shaped frame. A pair of side panels are pivotally mounted between one leg of each frame to form an alley therebetween. Each side panel has a generally horizontal base member pivotally mounted immediately adjacent the ground between one leg of each frame such that the side panel will pivot about the base member from a generally horizontal position to an upright vertical position. A lock mechanism at each end of each panel includes a retractable pin which may be inserted within one of a plurality of apertures in a channel mounted on each frame. The channels are oriented so that the side panels may be selectively pivoted to a variety of positions, such that the alley way may be widened for larger animals.