Eggs are a great source of protein. Yolks are fine. Given along with regular food, you may be looking at too much fat.
A dog should not need egg to have a shiny coat. And any fat can have similar effects anyway. If a pup's coat is very dull, maybe a whole diet change is needed.
While I'm not going to debate raw vs non raw today, here is a link to give the other side of things.
PetDiets