The pet food is close to the human beings food in the fine level, the health index and the ingredients, some of them request more highly than human beings. In extruder, the ingredients are cookedunder intense heat and pressure as it moves toward the open end of the extruder where ingredients pass through a shaping die and knife. Cat food is dried in a multi-pass dryer until its moisture content is low enough to make it shelf stable. Cat food may pass through a coating drum where animal fat and vitamins are applied onto cat food.