Pork liver is the hepatic gland of a pig and is usually used to enhance the flavour of pet foods, but also is very nutrient rich food. We recommend that liver, as with any organs, be used in the proper quantities (up to 5-10% of the diet) and come from a source where the cow has not been given any antibiotics/hormones. Pork is less digestible than other meats, and is not a preferred source for meat.