An edible pet chew, comprising: an extruded plant-based high density tube member being a separate member or an extruded plant-based high density sheet member being a separate member, wherein said extruded plant-based high density tube member comprises at least 20% plant starch by weight on an as fed basis or on a dry matter basis, wherein said extruded plant-based high density sheet member comprises at least 20% plant starch by weight on an as fed basis or on a dry matter basis; and a cellular low density material member being a separate member, wherein said cellular low density material member comprises numerous air bubbles interspersed into the material, wherein said cellular low density material member is formed by an extrusion process or an injection process, wherein the bulk density of said extruded plant-based high density tube member is at least 10% larger than that of said cellular low density material member wherein said extruded plant-based high density tube member is a long hollow object, wherein the bulk density of said extruded plant-based high density sheet member is at least 10% larger than that of said cellular low density material member, wherein said extruded plant-based high density tube member and said cellular low density material member are separate members to form a final product of said edible pet chew together, wherein said extruded plant-based high density tube member and said cellular low density material member are assembled together in a predetermined relationship, wherein said extruded plant-based high density sheet member and said cellular low density material member are separate members to form a final product of said edible pet chew together, wherein said extruded plant-based high density sheet member and said cellular low density material member are assembled together in a predetermined relationship. an extruded plant-based high density tube member being a separate member or an extruded plant-based high density sheet member being a separate member, wherein said extruded plant-based high density tube member comprises at least 20% plant starch by weight on an as fed basis or on a dry matter basis, wherein said extruded plant-based high density sheet member comprises at least 20% plant starch by weight on an as fed basis or on a dry matter basis; and a cellular low density material member being a separate member, wherein said cellular low density material member comprises numerous air bubbles interspersed into the material, wherein said cellular low density material member is formed by an extrusion process or an injection process, wherein the bulk density of said extruded plant-based high density tube member is at least 10% larger than that of said cellular low density material member wherein said extruded plant-based high density tube member is a long hollow object, wherein the bulk density of said extruded plant-based high density sheet member is at least 10% larger than that of said cellular low density material member, wherein said extruded plant-based high density tube member and said cellular low density material member are separate members to form a final product of said edible pet chew together, wherein said extruded plant-based high density tube member and said cellular low density material member are assembled together in a predetermined relationship, wherein said extruded plant-based high density sheet member and said cellular low density material member are separate members to form a final product of said edible pet chew together, wherein said extruded plant-based high density sheet member and said cellular low density material member are assembled together in a predetermined relationship.