Aspergillus niger is a versatile filamentous fungus found in the environment all over the world in soil and on decaying plant material and it has been reported to grow on a large number of foods and feeds. At the same time it is a popular production host for industrial fermentations and it is used for production of both organic acids (citric acid) and for indigenous and heterologous enzymes and proteins. Apergillus niger functions as protease type enzyme throughout a dogs digestive system. Dog health is highly dependent on their ability to metabolize nutrients.