Methods for producing pet food from animals may utilize a multi-step process including a first processing system that may include at least a heating step through use of a steam jacketed tube system and a draining step to squeeze out the oils. Grinding and pre-breaking may first be used to break the fat/whole animal into pieces. The protein may be cooked in the first processing system, and a second processing system may cook the protein with hot water in the second heating step. The second processing system may wash impurities out of the protein and subject the protein to a high intensity flame that may burn off foreign matter, and/or microbes. The protein may be dried and may produce pet food for consumption by pets.