Its rounded shape frame resembling the shape of a sow's belly gave this heavy duty, cattleman/stockman style knife its name over a century ago. The Sowbelly (39) is a favorite pattern among collectors. The three-bladed Sowbelly usually carries clip, sheepfoot, and spey blades. The five-bladed Sowbelly holds a clip, sheepfoot, spey, short clip, and pen blades.