Chicken Fat Chicken fat is most commonly used as an ingredient in dog and cat food. It is a by-product of the poultry industries. It is the most digestable animal fat source available, with high levels of polyunsaturated fatty acids and linoleic (omega-6) acid. It is controversial as a food product because it is obtained from chicken rendering and processing. Chicken fat has uneven quality and is used in soaps or as filler in pet foods or human food. Currently, chicken fat is being researched as an alternative energy source. By converting chicken fat into biodiesel, motor vehicles can use chicken fat as a renewable energy source. "Chicken Soup for the Pet Lover's Soul : Products : Ingredients." Chicken Soup for the Pet Lover's Soul Brand Pet Foods. Diamond Pet Lovers, 2011. Web. 17 May 2011. . "Converting Chicken Fat to Biodiesel." E85 | Ethanol Gasoline Blend. Whipnet Technologies, 2011. Web. 17 May 2011. .