According to the Dog Logic website, this recipe is used to help dogs gain weight quickly after surgery. The egg yolks contain cysteine, which may have protective effects on the liver; the peanut butter is a high-calorie, nutritious food rich in calcium and iron. The ground beef supplies high-quality protein.
Dogs are Opertunistic carnivores: this means that veggies/fruit and plant matter are okay as an occasional treat but not meant to be a main part of their diet.