Egg yolks are a rich source of nutrients. They contain fats like neutral fat, lecithin, and cholesterol, along with calcium, phosphorus, iron, and other essential minerals. Additionally, egg yolks are high in protein and contain valuable vitamins such as vitamin A, vitamin D, and vitamin B. Egg yolks play a significant role in promoting brain development. Lecithin present in egg yolks can be digested by cats and dogs, releasing choline into the bloodstream, which helps in brain development for puppies and prevents cognitive decline in adult dogs, enhancing memory. Moreover, lecithin aids in liver cell regeneration and promotes overall metabolism. Furthermore, egg yolks support hair growth in cats and dogs by effectively stimulating hair generation and nourishing their coat. Especially for long-haired dogs, including egg yolks in their diet can help maintain healthy fur throughout their body.