A twin screw processing device operable to create a product from a mixture comprising meat and other conventional pet food ingredients selected from grains, starches and fats, said device comprising: an elongated barrel having a material inlet for said mixture and a processed material outlet, an elongated delivery pipe secured to said barrel outlet, and a restricted orifice die operably coupled with said elongated delivery pipe; a pair of elongated, axially rotatable, helical screws (124, 126) within said barrel, each of said screws (124, 126) having an elongated shaft (128, 130) with an elongated shaft hollow central core, and elongated helical flighting (132, 134) extending outwardly from said shaft (128, 130), said elongated shaft hollow central core configured to receive heat exchange media, said helical screws (124, 126) configured for driven, directional co-rotation; and a media delivery assembly including a pair of media delivery tubes (178, 180) extending from a point outside of said barrel and respectively into a corresponding one of said elongated shaft hollow central cores, and structure (88, 90) coupled with said delivery tubes (178, 180) permitting introduction of media to said tubes (178, 180) for delivery into said elongated shaft hollow central cores, each of said helical screws (124, 126) having a first helical flighting section with a pitch length D1 of from about 0.4-1.2 based upon the diameter of the first helical flighting section and operable to convey material from said material inlet toward and through said processed material outlet, and a second helical flighting section proximal to said processed material outlet and operable to retard the flow of material therepast, said first and second helical flighting sections (148, 162) being of opposite hand, said second helical flighting section being shorter than said first helical flighting section and having a pitch length from about 0.2-1.1, said first and second helical flighting sections (148, 162) being intermeshed, and said first helical flighting section having a hollow helical core along the length thereof, said helical core being in communication with said hollow central core. an elongated barrel having a material inlet for said mixture and a processed material outlet, an elongated delivery pipe secured to said barrel outlet, and a restricted orifice die operably coupled with said elongated delivery pipe; a pair of elongated, axially rotatable, helical screws (124, 126) within said barrel, each of said screws (124, 126) having an elongated shaft (128, 130) with an elongated shaft hollow central core, and elongated helical flighting (132, 134) extending outwardly from said shaft (128, 130), said elongated shaft hollow central core configured to receive heat exchange media, said helical screws (124, 126) configured for driven, directional co-rotation; and a media delivery assembly including a pair of media delivery tubes (178, 180) extending from a point outside of said barrel and respectively into a corresponding one of said elongated shaft hollow central cores, and structure (88, 90) coupled with said delivery tubes (178, 180) permitting introduction of media to said tubes (178, 180) for delivery into said elongated shaft hollow central cores, each of said helical screws (124, 126) having a first helical flighting section with a pitch length D1 of from about 0.4-1.2 based upon the diameter of the first helical flighting section and operable to convey material from said material inlet toward and through said processed material outlet, and a second helical flighting section proximal to said processed material outlet and operable to retard the flow of material therepast, said first and second helical flighting sections (148, 162) being of opposite hand, said second helical flighting section being shorter than said first helical flighting section and having a pitch length from about 0.2-1.1, said first and second helical flighting sections (148, 162) being intermeshed, and said first helical flighting section having a hollow helical core along the length thereof, said helical core being in communication with said hollow central core.