Chicken livers are a safe food for dogs and can be served either raw or cooked. According to The Daily Puppy, chicken livers are filled with dog-friendly vitamins and nutrients, such as vitamin A, vitamin B, iron, protein, and omega-3 and omega-6 fatty acids.
While chicken livers are a safe food for dogs, eating too many livers can cause health problems. According to VetInfo, too much chicken liver can result in an overdose of vitamin A, potentially causing bone deformity, bone spurs, muscle weakness, stiffness and digestive problems. The amount of chicken liver a dog can have is dependant upon the dog's size; the larger the dog, the more chicken livers it can safely consume.