In the wild, wolves will go after and consume the internal organs before the tougher, less nutrient-rich muscle meat in their prey. Preferred organs include the liver, heart and stomach. These organs are the best part of the body as far as nutrients go.
Liver is a nutrient-rich organ meat that most dogs readily eat. Liver can provide your dog with protein, fat and vitamin A, all of which help him stay healthy if offered in moderation. Liver is also a good source of copper, iron, niacin, phosphorus and zinc. It provides many B vitamins, omega-3 and omega-6 fatty acids, and essential amino acids your dog needs from their diet to keep him healthy.
Small portions of liver are ideal a couple to a few times per week, but not more than this.